Expand using appropriate identities:(y – 5)(y + 5) – InterviewSolution

InterviewSolution

1.

Expand using appropriate identities:(y – 5)(y + 5)

Answer»

(y – 5)(y + 5)

Comparing (y – 5) (y + 5) with (a – b) (a + b) we get a = y; b = 5

(a – b)(a + b) = a² – b²

(y – 5)(y + 5)

= y² – 5²

= y² – 25

Discussion

No Comment Found

Related InterviewSolutions

Write the Variable, Coefficient and Constant in the given algebraic expression, Expressionx + 73y - 25x22xy + 11\(-\frac{1}{2}p + 7\)-8 + 3aVariableCoefficientConstant
4/2 = 2 denotes a(A) numerical equation (B) algebraic expression(C) equation with a variable (D) false statement
x – 4 = – 2 has a solution(A) 6 (B) 2 (C) – 6 (D) – 2
Write the corresponding expressions.z is multiplied by -3 and the result is subtracted from 13.
q/2 = 3 has a solution(A) 6 (B) 8 (C) 3 (D) 2
The expression obtained when x is multiplied by 2 and then subtracted from 3 is(A) 2x – 3 (B) 2x + 3 (C) 3 – 2x (D) 3x – 2
The area of a square having each side x is(A) x × x (B) 4x (C) x + x (D) 4 + x
Savitri has a sum of Rs x. She spent Rs 1000 on grocery, Rs 500 on clothes and Rs 400 on education, and received Rs 200 as a gift. How much money (in Rs) is left with her?(A) x – 1700 (B) x – 1900 (C) x + 200 (D) x – 2100
Find the unit digit of the following numeric expressions.(i) 11420 + 11521 + 11622(ii) 1000010000 + 1111111111
The unit digit of (32 x 65)0 is(i) 2(ii) 5(iii) 0(iv) 1