Question

Factor: x2 + x - 90

Answer 1

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

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)