Question

Explain how to simplify the ratio x^2 - x - 20 over x^2 + 8x + 16

Answer 1

factorise x^2 - x - 20 and x^2 + 8x + 16

Answer 2

(x-5)(x+4)/(x+4)(x+4)

Answer 3

=(x-5)/(x+4)

Answer 4

x^2-x-20=(x-5)(x-4)
x^2 + 8x + 16=(x+4)^2
Divide both
(x-5)/(x+4)

Answer 5

thank you!