Question

If `f( x ) = 3x ^ { 3} - 13x ^ { 2} + 6x - 4`, what is `f(3)`?

Answer 1

`-22`

Explanation:

Replace all the x’s in f(x) with 3 so you can evaluate it ..

`f(x) = 3x^3-13x^2+6x-4`

`f(3) = 3(3)^3-13(3)^2+6(3)-4`

`= 3(27)-13(9)+6(3)-4`

`= 81-117+18-4`

`=-22`