Question

1. x2 + 7x + 12
3. x2 + 3x - 10
5. 5x2-4-8x (CBS

Answer 1

1.

===> x² + 7x + 12

===> x² + 4x + 3x + 12

===> x(x + 4) + 3(x + 4)

===> (x + 4)(x + 3)

☛ x = -4 , -3

2.

===> x² + 3x - 10

===> x² + 5x - 2x - 10

===> x(x + 5) - 2( x + 5)

===> (x + 5)(x - 2)

☛ x = -5 , 2

3.

===> 5x² - 8x - 4

===> 5x² - 10x + 2x - 4

===> 5x(x - 2) + 2(x - 2)

===> (x - 2)(5x + 2)

☛ x = 2 , -2/5