Question

Factor: x2 + x - 90

Answer 1

The factor is : (x+10)(x-9)

Step-by-step explanation:

Given,

$x^{2} +x-90$

To find the factors.

We apply middle term factor rule.

$x^{2} +x-90$

= $x^{2} +(10-9)x -90$ [ 90 = 10×9]

= $x^{2} +10x-9x-90$

= x(x+10)-9(x+10)

= (x+10)(x-9)

Hence,

The factor is : (x+10)(x-9)