Algebra problem

Question

Write the expression for f(3x)

I don’t understand the question

Answer 1

Well, first you need to know what f(x) is (you don't mention that). Then you plug in "3x" in place of "x" in the function.

For example, if f(x) = 2x² + 1 and you wanted to know what f(3) is, you would plug in "3" for "x" to get f(3) = 2(3)² + 1 = 2•9 + 1 = 18 + 1 = 19. The same would be true if you wanted to find f(3x), you would plug in "3x" in place of "x" like this:

f(3x) = 2(3x)² + 1

f(3x) = 2•9x² + 1

f(3x) = 18x² + 1

Answer 2

Shelly

There must be a function definition f(x) = ................. which is missing here

Then you evaluate the function, writing 3x instead of x

Mike