Question

How do you solve `x^2 – 9x = -20` by factoring?

Answer 1

`x=4` or `x=5`

Explanation:

`x^2-9x=-20`

`rarrcolor(white)("XXX")x^2-9x+20=0`

`rarrcolor(white)("XXX")(x-4)(x-5) =0`

`rarrcolor(white)("XXX")(x-4)=0` or `color(white)("XX")(x-5)=0`

`rarrcolor(white)("XXX")x=4color(white)("XXXX")` or `color(white)("XX")x=5`