Factor completely.
4x^2 - 28x + 40 =

4(x-2)(x-5)

Step-by-step explanation:

Factor x^2-7x+10x  

2

−7x+10x, squared, minus, 7, x, plus, 10

\begin{aligned} &\phantom{=}4x^2-28x+40 &=4(x^2-7x+10) &=4(x-2)(x-5) \end{aligned}  

=4x  

2

−28x+40

=4(x  

2

−7x+10)

=4(x−2)(x−5)

x/3-10=8

x/3=18

x=48