use the function to evaluate the indicated expressions and simplify: f(x)= x+4; f(2x), (f(x))^2

Question

anonymous · Answer

How do you work it out STEP BY STEP

lalaly · Answer

f(2x) u plug in 2x instead of x in f(x)
$$f(2x)=(2x)+4  $$

lalaly · Answer

(f(x))^2 u square the function f(x) >> (x+4)^2

anonymous · Answer

that aint right, i have the answers in the back of the bok to show my work but i just dont know how to get those answers

anonymous · Answer

book*

lalaly · Answer

what are the answers?

anonymous · Answer

x^2 + 4 and x^2+8x+16

lalaly · Answer

u wrote the question wrong, based on ur answers the first one shud be f(x^2) and the second one i got it right, just expand the brackets

anonymous · Answer

no I didn't .. the question is..and im looking straight from the book. 

f(x)=4;   f(x^2) and (f(x))^2

anonymous · Answer

ok nevermind i see what i did. i just need to know how to work them out

lalaly · Answer

yeh look at ur question above
f(2x)? ????

anonymous · Answer

ok i said messed up .. how do you work the second one out where i can understand it

lalaly · Answer

$$(f(x))^{2}=(x+4)^{2}= x ^{2}+8x+16$$

anonymous · Answer

ohhhhh ok thanks