Question

Use the functions to answer the question.

f(x) = 4x – 1; g(x) = 5x^2

Which is equal to (f * g) (x)?

80x^2 – 40x + 5
20x^3 – 5x^2
5x^2 + 4x – 1
20x^2 – 1

Answer 1

This is obviously composite functions, so (f º g)(x) = f(g(x)) = 4x - 1 = 4(5x^2) - 1 = 20x^2 - 1. So, the answer is D, the last one.

Answer 2

Thank you so much for your help!

Answer 3

You welcome, a medal would be nice if you are satisfied :).

Answer 4

I already put your answer as the best response.

Answer 5

Okay, thanks, :). Good luck with your homework/test/etc.

Answer 6

Thank you!