Question

Evaluate f(3) x(5x-9)

I think I have the answer just now sure thanks if you can help

Answer 1

18

Explanation:

Put 3 where x is, then do the arithmetic.

... f(x) = x(5x -9)

... f(3) = 3(5·3 -9) = 3(15 -9) = 3·6

... f(3) = 18

_____

Your calculator can do this, too.