Question

Find x, if f(x)=-5
and f(x)=3x^2+2x-1

Answer 1

since f(x) = 2 different things, you can set those 2 different things equal to each other
-5 = 3x^2+2x-1
add 5 to both sides
factor
there will be 2 answers for x

Answer 2

so, I would use the quadratic equation, right?

Answer 3

either that or factor it (idk if you can factor it, you can try, but it might not work)

Answer 4

Oh, thanks :)