Question

If f(x) = x2 + 2x, which expression represents f(x + 2)?

Answer 1

A)
x2 + 2x + 2

Answer 2

x2 + 4x + 4

Answer 3

\[\large\rm f(\color{orangered}{x}) = (\color{orangered}{x})^2 + 2(\color{orangered}{x})\]

Answer 4

\[\large\rm f(\color{orangered}{x+2}) = (\color{orangered}{x+2})^2 + 2(\color{orangered}{x+2})\]

Answer 5

@zepdrix is leaning on to the right idea

Answer 6

Do you understand what I did?
I replaced every x with x+2.
Now you need to expand out the squared term.

Answer 7

Like zepdrix showed, you just need to plug in the value that they give you and solve.

Answer 8

The x in f(x) was replaced with x+2, so you should do that to the other side of the equation as well.

Answer 9

thanks u guys are good people