Question

Solve by inspection. Which two are solutions for x^2+4x−21=0
?(2 points)
Responses

x=−3
x is equal to negative 3

x=3
x is equal to 3

x=−7
x is equal to negative 7

x=7
x is equal to 7

Answer 1

Factor: x^2 + 4x − 21 = (x + 7)(x − 3) = 0, so x = −7 or x = 3.