Question

If f(x) = -7x+5x^2+10, what does f(-2) equal?

Answer 1

-7x+5x^2+10 f(-2)        given

-7(-2)+5(-2)^2+10         plug in -2 where you see X

14+5(4)+10                   do (-2)^2                

14+20+10                    multiply 5(4)

45                               add your numbers (this is the final)

Answer 2

f(x) = -7x + 5x² + 10

f(-2) This means that x is -2, so you plug in -2 for "x" in the equation

f(x) = -7x + 5x² + 10

f(-2) = -7(-2) + 5(-2)² + 10

f(-2) = 14 + 5(4) + 10

f(-2) = 20 + 24

f(-2) = 44