f(x) = 2x(sqd)+ 6x- 8 when f(x) =12 How do I work this out?

Not sure of the steps to solve this equation. Thanks
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1 Answer

12=2x^2+6x-8

2x^2+6x-8-12=0

2x^2+6x-20=0

2x^2+10x-4x-20=0

2x(x+5)-4(x+5)=0

(x+5)(2x-4)=0

x+5=0       or 2x-4=0

x=-5      or x=2
by Level 8 User (32.3k points)

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