1.

Calculate the value of A if (sec-2) (tan 3A -1)= 0​

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Quadratic Equations Exercise 5A – Selina Concise Mathematics Class 10 ICSE Solutions

Find which of the following equations are quadratic:

Solution 1(i)

(3x – 1)2 = 5(x + 8)

⇒ (9X2 – 6x + 1) = 5x + 40

⇒ 9x2 – 11x – 39 =0; which is of the form ax2 + bx + c = 0.

∴ Given equation is a quadratic equation.

Solution 1(ii)

5x2 – 8x = -3(7 – 2X)

⇒ 5x2 – 8x = 6x – 21

⇒ 5x2 – 14x + 21 =0; which is of the form ax2 + bx + c = 0.

∴ Given equation is a quadratic equation.

Solution 1(iii)

(x – 4)(3x + 1) = (3x – 1)(x +2)

⇒ 3x2 + x – 12x – 4 = 3x2 + 6x – x – 2

⇒ 16x + 2 =0; which is not of the form ax2 + bx + c = 0.

∴ Given equation is not a quadratic equation.

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