Question

If f(x) = 2x + 4 and g(x) = (x^2 + x + 5), find g (f(x)).

Answer 1

whereever you see an x in the equation g(x) , replace it by (2x+4)

ig g (f(x)) = (2x+4)^2 + (2x+4) +4

Answer 2

then you could expand, collect like terms , etc

Answer 3

instead of subing in just a single number into the function, you are subing a whole function into the function

Answer 4

elecengineer, did you not the the 5 that was in the original g(x)????

Answer 5

dont quite understand what you meant ^

But yes looking back at it the last thing should be a 5

ie the answer is g (f(x)) = (2x+4)^2 +(2x+4) + 5

Answer 6

*the should of read need. Ok I see what you did. Thanks. I'm sure JAPAN1593 can finish it up now.

Answer 7

JAPAN1593, do you understand what to do to finish the problem?

Answer 8

yes thank you all