equivalent expressions

Question

If f(x) = 3x - 5 and g(x) = x - 9, what expression is equivalent to (f*g)(x)?

Answer 1

(f*g)(x) = f(x) * g(x).

 

If we multiply the rules, we'll get the equivalent expression.

 

(3x-5)(x-9)=3x²-27x-5x+45=3x²-32x+45