Given the functions f(x) = 7x + 13 and g(x) = x + 2, which of the following functions represents f[g(x)] correctly?

f[g(x)] = 7x + 15
f[g(x)] = 7x + 27
f[g(x)] = 7x2 + 15
f[g(x)] = 7x2 + 27

Question

Given the functions f(x) = 7x + 13 and g(x) = x + 2, which of the following functions represents f[g(x)] correctly?

 f[g(x)] = 7x + 15
 f[g(x)] = 7x + 27
 f[g(x)] = 7x2 + 15
 f[g(x)] = 7x2 + 27

anonymous · Answer

someone help
??

setsuna-yuregeshi · Answer

is 7x2 supposed to be this: $$7x ^{2}$$? Or &x2 as in 7 times x times 2?

anonymous · Answer

its 7x^2 but only on the answer choices not the question.

anonymous · Answer

yes

setsuna-yuregeshi · Answer

So what do you think you are supposed to do here?

anonymous · Answer

im not sure, it says with the represent f[g(x)]

anonymous · Answer

$$given f(x)=7x+13 , g(x)= x+2$$
now $$f[g(x)]=7(x+2)+13$$
$$f[g(x)]=7x+14+13$$
$$\therefore f[g(x)=7x+27$$

anonymous · Answer

THANKYOU

anonymous · Answer

cheers! First step of problem solving- Understanding Problem/question ( source: How to Sovle It - George Polya)