Find the zeros of the following qbetween the zeros and the coef1. x2+7

1.	Find the zeros of the following qbetween the zeros and the coef1. x2+7x +123. x2 + 3x-105. 5x2 -4-8x [CBSE 2008]7. 2x2-11x + 15
Answer» 1)x^2 + 7x + 12 = 0 x^2 + 4x + 3x + 12 = 0 x(x + 4) + 3(x + 4) = 0 (x + 3)(x + 4) = 0 x = - 3, - 4 2) x^2 + 3x - 10 = 0 x^2 + 5x - 2x - 10 = 0 x(x + 5) - 2(x + 5) = 0 (x - 2)(x +5) = 0 x = 2, - 5

Find the zeros of the following qbetween the zeros and the coef1. x2+7x +123. x2 + 3x-105. 5x2 -4-8x [CBSE 2008]7. 2x2-11x + 15

Answer»

1)x^2 + 7x + 12 = 0 x^2 + 4x + 3x + 12 = 0 x(x + 4) + 3(x + 4) = 0 (x + 3)(x + 4) = 0 x = - 3, - 4

2) x^2 + 3x - 10 = 0 x^2 + 5x - 2x - 10 = 0 x(x + 5) - 2(x + 5) = 0 (x - 2)(x +5) = 0 x = 2, - 5