Question

What is the solution set for x^2−x−72=0
?

(1 point)
Responses

{−9,−8}
start set negative 9 comma negative 8 end set

{−8,9}
start set negative 8 comma 9 end set

{4,9}
start set 4 comma 9 end set

{−4,9}
start set negative 4 comma 9 end set

Answer 1

Solve x^2 − x − 72 = 0 by factoring:
x^2 − x − 72 = (x − 9)(x + 8) = 0
So x = 9 or x = −8.

Answer: {−8, 9}