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2801.

For the equation x2+bx+c=0, if 1+b+c=0 for all b,c∈R, then the roots are

Answer»

For the equation x2+bx+c=0, if 1+b+c=0 for all b,cR, then the roots are

2802.

Find the value of b, if one root of the equation x2 + ax + 2b = 0 is 2 + 4i, where a, b ∈ R

Answer»

Find the value of b, if one root of the equation x2 + ax + 2b = 0 is 2 + 4i, where a, b ∈ R


2803.

If f(x)=x2+2bx+2c2 and g(x)=−x2−2cx+b2 are such that the minimum value of f(x) always exceeds maximum value of g(x), then which of the following is/are correct?

Answer»

If f(x)=x2+2bx+2c2 and g(x)=x22cx+b2 are such that the minimum value of f(x) always exceeds maximum value of g(x), then which of the following is/are correct?

2804.

The value of a for which x3+ax+1=0 and x4+ax2+1=0 have exactly one common root is

Answer»

The value of a for which x3+ax+1=0 and x4+ax2+1=0 have exactly one common root is

2805.

If α,β,γ,δ are the roots of equation 2x4+4x3−3x2+3x+1=0, then value of 12α−1+12β−1+12γ−1+12δ−1 is

Answer»

If α,β,γ,δ are the roots of equation 2x4+4x33x2+3x+1=0, then value of 12α1+12β1+12γ1+12δ1 is

2806.

Plot the graph of y=(x-3)2+7

Answer»

Plot the graph of y=(x-3)2+7


2807.

The number of intergral values of a for which y=x2−ax+11x2−5x+4 can take all real values is

Answer» The number of intergral values of a for which y=x2ax+11x25x+4 can take all real values is
2808.

If α,β,γ be the roots of the equation (x−a)(x−b)(x−c)=d,d≠0, then the roots of the equation (x−α)(x−β)(x−γ)+d=0 are

Answer»

If α,β,γ be the roots of the equation (xa)(xb)(xc)=d,d0, then the roots of the equation (xα)(xβ)(xγ)+d=0 are

2809.

If a,b,c,d and p are distinct non-zero real numbers such that (a2+b2+c2)p2−2(ab+bc+dc)p+(b2+c2+d2)≤0, then ac is equal to

Answer»

If a,b,c,d and p are distinct non-zero real numbers such that (a2+b2+c2)p22(ab+bc+dc)p+(b2+c2+d2)0, then ac is equal to

2810.

For the equation |x|2+|x|−6=0,the sum of the real roots is

Answer»

For the equation |x|2+|x|6=0,the sum of the real roots is


2811.

Let p, q, r be roots of cubic equation x3+2x2+3x+3=0, then

Answer»

Let p, q, r be roots of cubic equation x3+2x2+3x+3=0, then

2812.

The range of a for which x2−ax+1−2a2 is always positive for all real values of x, is

Answer»

The range of a for which x2ax+12a2 is always positive for all real values of x, is

2813.

The number of integral values of k, for which (x2−x+1)(kx2−3kx−5)<0 is

Answer» The number of integral values of k, for which (x2x+1)(kx23kx5)<0 is
2814.

The number of all possible positive integral values of α for which the roots of the quadratic equation, 6x2−11x+α=0 are rational numbers is :

Answer»

The number of all possible positive integral values of α for which the roots of the quadratic equation, 6x211x+α=0 are rational numbers is :

2815.

If the zeroes of monic cubic polynomial are 3,5 and 6, then the cubic polynomial is

Answer»

If the zeroes of monic cubic polynomial are 3,5 and 6, then the cubic polynomial is

2816.

If x1, x2, x3⋯xn are roots of xn+ax+b=0, then the value of (x1−x2)(x1−x3)(x1−x4)⋯(x1−xn) =

Answer»

If x1, x2, x3xn are roots of xn+ax+b=0, then the value of (x1x2)(x1x3)(x1x4)(x1xn) =


2817.

The value(s) of k for which the quadratic equations (1−2k)x2−6kx−1=0 and kx2−x+1=0 have at least one root in common, is (are)

Answer»

The value(s) of k for which the quadratic equations (12k)x26kx1=0 and kx2x+1=0 have at least one root in common, is (are)

2818.

If x2−ax+b=0 and x2−px+q=0 have one root common and the second equation has equal roots, then b+q is equal to

Answer»

If x2ax+b=0 and x2px+q=0 have one root common and the second equation has equal roots, then b+q is equal to

2819.

The value of y=2+14+14+14+14+......∞ is

Answer»

The value of y=2+14+14+14+14+...... is

2820.

The number of integral value(s) of x satisfying the inequality √(x−3)(2−x)&lt;√4x2+12x+11, is

Answer» The number of integral value(s) of x satisfying the inequality (x3)(2x)<4x2+12x+11, is
2821.

The least integral value of k for which (k−1)x2+8x+k+5 is always positive ∀ x∈R, is

Answer» The least integral value of k for which (k1)x2+8x+k+5 is always positive xR, is
2822.

Let ax2+bx+6=0 does not have distinct real roots. If the least value of 3a+b is k, then the value of |k| is

Answer» Let ax2+bx+6=0 does not have distinct real roots. If the least value of 3a+b is k, then the value of |k| is
2823.

Let α,β be the roots of the equation x2−px+r=0 and α2,2β be the roots of the equation x2−qx+r=0. Then, the value of r is:

Answer»

Let α,β be the roots of the equation x2px+r=0 and α2,2β be the roots of the equation x2qx+r=0. Then, the value of r is:


2824.

If x2+ax+bc=0, x2+bx+ac=0, a≠b have one root in common, then their other roots satisfy the equation

Answer»

If x2+ax+bc=0, x2+bx+ac=0, ab have one root in common, then their other roots satisfy the equation

2825.

The minimum integral value of a for which x2−x1−ax attains all real values, is

Answer» The minimum integral value of a for which x2x1ax attains all real values, is
2826.

Solve the following quadratics 13x2+7x+1=0

Answer»

Solve the following quadratics 13x2+7x+1=0

2827.

If x2−2x+log12p=0 does not have two distinct real roots, then the maximum value of p is

Answer»

If x22x+log12p=0 does not have two distinct real roots, then the maximum value of p is

2828.

If p(x) is a polynomial of degree greater than 2 such that p(x) leaves remainder a and −a when divided by x+a and x−a respectively. If p(x) is divided by x2−a2 then remainder is

Answer»

If p(x) is a polynomial of degree greater than 2 such that p(x) leaves remainder a and a when divided by x+a and xa respectively. If p(x) is divided by x2a2 then remainder is

2829.

Suppose a2=5a−8 and b2=5b−8. Then the equation whose roots are ab and ba is

Answer»

Suppose a2=5a8 and b2=5b8. Then the equation whose roots are ab and ba is

2830.

If the equations x2−kx−21=0 and x2−3kx+35=0 have a common root α&lt;0, then the value of |k| is

Answer» If the equations x2kx21=0 and x23kx+35=0 have a common root α<0, then the value of |k| is
2831.

If α,β are the root of a quadratic equation x2−3x+5=0, then the equation whose roots are (α2−3α+7) and (β2−3β+7) is

Answer»

If α,β are the root of a quadratic equation x23x+5=0, then the equation whose roots are (α23α+7) and (β23β+7) is

2832.

If 1−p is a root of the equation x2+px+1−p=0, then the roots of the equation are

Answer»

If 1p is a root of the equation x2+px+1p=0, then the roots of the equation are

2833.

If α,β are the roots of the equation x2−4x+3=0, then the value of √α4+β4−1 is

Answer» If α,β are the roots of the equation x24x+3=0, then the value of α4+β41 is
2834.

If k1,k2,k3 are real numbers and the equation k1x2+k2x+k3=0 have three roots, then value of k1+k2+k3 is

Answer»

If k1,k2,k3 are real numbers and the equation k1x2+k2x+k3=0 have three roots, then value of k1+k2+k3 is


2835.

The number of integral values of m such that the roots of x2−(m−3)x+m=0 lie in the interval (1,2), is

Answer» The number of integral values of m such that the roots of x2(m3)x+m=0 lie in the interval (1,2), is
2836.

The number of integral values of a for which 4t−(a−4)2t+9a4&lt;0, ∀ t∈(1,2) is

Answer» The number of integral values of a for which 4t(a4)2t+9a4<0, t(1,2) is
2837.

The least positive value of a for which 4x−a⋅2x−a+3≤0 is satisfied by atleast one real value of x is

Answer» The least positive value of a for which 4xa2xa+30 is satisfied by atleast one real value of x is
2838.

If α,β are roots of 4x2−16x+c=0, c&gt;0 such that 1&lt;α&lt;2&lt;β&lt;3, then the number of integral value of c is

Answer» If α,β are roots of 4x216x+c=0, c>0 such that 1<α<2<β<3, then the number of integral value of c is
2839.

The number of the distinct zeroes of the polynomial f(x)=x(x−4)3(x−3)2(x−1) is

Answer» The number of the distinct zeroes of the polynomial f(x)=x(x4)3(x3)2(x1) is
2840.

The least value of expression x2−4xy+5y2−2y+6, if x,y∈R is

Answer» The least value of expression x24xy+5y22y+6, if x,yR is
2841.

Let f(x)=x5+ax3+bx. The remainder when f(x) is divided by x+1 is −3. Then the remainder when f(x) is divided by x2−1, is

Answer»

Let f(x)=x5+ax3+bx. The remainder when f(x) is divided by x+1 is 3. Then the remainder when f(x) is divided by x21, is

2842.

Let p and q be real numbers such that p≠0,p3≠q and p3≠−q . If α and β are nonzero complex numbers satisfying α+β=−p and α3+β3=q , then a quadratic equation having αβ and βα as its roots is -

Answer»

Let p and q be real numbers such that p0,p3q and p3q . If α and β are nonzero complex numbers satisfying α+β=p and α3+β3=q , then a quadratic equation having αβ and βα as its roots is -

2843.

The value of √2+√2+√2+……∞ is

Answer» The value of 2+2+2+ is
2844.

Let α and β are two real roots of the equation (k+1)tan2x−√2λtanx=1−k, where k≠−1 and λ are real numbers. If tan2(α+β)=50, then the value of λ is

Answer»

Let α and β are two real roots of the equation (k+1)tan2x2λtanx=1k, where k1 and λ are real numbers. If tan2(α+β)=50, then the value of λ is

2845.

The number of real roots of the equation (x2+2x)2−(x+1)2−55=0

Answer»

The number of real roots of the equation (x2+2x)2(x+1)255=0


2846.

The complete set of values of a for which the inequality ax2−(3+2a)x+6&gt;0,a≠0 holds good for exactly three integral values of x is

Answer»

The complete set of values of a for which the inequality ax2(3+2a)x+6>0,a0 holds good for exactly three integral values of x is

2847.

The set of values of k for which the equation (k+2)x2−2kx−k=0 has two roots on the number line symmetrically placed about 1 is

Answer»

The set of values of k for which the equation (k+2)x22kxk=0 has two roots on the number line symmetrically placed about 1 is

2848.

If the product of the roots of the quadratic equation mx2−2x+(2m−1)=0 is 3, then the value of m is

Answer»

If the product of the roots of the quadratic equation mx22x+(2m1)=0 is 3, then the value of m is

2849.

The values of a for which the number 6 lies in between the roots of the equation x2+2(a−3)x+9=0, belong to

Answer»

The values of a for which the number 6 lies in between the roots of the equation x2+2(a3)x+9=0, belong to

2850.

Solve the following quadratics 17x2−8x+1=0

Answer»

Solve the following quadratics 17x28x+1=0