Question

If the area rectangle below us 39 square feet find the x value

Answer 1

x=5 and x=-11

Explanation:

(x-2)(x+8)=39

`x^2+6x-16=39`

Subtract 39 from both sides

`x^2+6x-55=0`

Factor:

(x-5)(x+11)=0

Set factors to 0.

x-5 =0

x+11 =0

x=5, x=-11