Question

What are the solutions to the quadratic equation 4x2 + 28x = 0?

x = 4 and x = −7
x = 4 and x = 7
x = 0 and x = −7
x = 0 and x = 7

Answer 1

x=0

x= -7

Explanation:

just took the test

Answer 2

4x^2 + 28x = 0

First step: take out the GCF

4x(x + 7) = 0

2nd step: equal each expression to 0

4x = 0
(x + 7) = 0

3rd: solve

4x= 0
x = 0
x + 7 = 0
x= -7

So the answer is x= 0 and x= -7