jolie3000 wrote:Does this make more sense:

2f(x)=2(2x+1)=4x+2

this is correct

- Martingale
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jolie3000 wrote:Does this make more sense:

2f(x)=2(2x+1)=4x+2

this is correct

- stapel_eliz
**Posts:**1738**Joined:**Mon Dec 08, 2008 4:22 pm-
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jolie3000 wrote:If ƒ(x) = 2x + 1, Find 2ƒ(x)

I originally worked it out like this:

ƒ(2(x))= 2(2(x)+ 1)

But 2 * f(x) is not at all the same thing as f(2*x). This is, in part, a result of the fact that the parentheses, in

jolie3000 wrote:Does this make more sense:

2f(x)=2(2x+1)=4x+2

Yes; two times f(x) means 2(f(x)) = 2(the formula for f) = 2(2x + 1).

Good job!

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