Given the following functions f(x) and g(x), solve f[g(7)] and select the correct answer below: f(x) = 4x + 21 g(x) = 2x + 2 16 49 85 784

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Given the following functions f(x) and g(x), solve f[g(7)] and select the correct answer below: f(x) = 4x + 21 g(x) = 2x + 2 16 49 85 784

Mathematics
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@e.mccormick @Elsa213

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Other answers:

work "inside out"
find g(7) and use this value for x in f(x)
okay.
note that you will get the same result if you substitute the expression first then do the number last
x=7g-2 -------- 2
no
|dw:1439410483025:dw|
g(7)=16
|dw:1439410539696:dw|
85?
c?
no question mark! yes good job.
Can you also help with this: Given the following functions f(x) and g(x), solve (f + g)(5) and select the correct answer below: f(x) = 8x − 13 g(x) = x − 9 23 27 31 40
|dw:1439410763924:dw|
you can do the substitution first it's ok
okay so 8*5 − 13+5-9 40-13+5-9 27+-4 23?
A?
yes
one more... 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)] = 7x^2 + 15 f[g(x)] = 7x^2 + 27
is it A?
no
C? I know you are adding 15, so
g(x) is your x in f(x)
|dw:1439411160771:dw|
to simplify you expand the parenthesis and group like terms
7*x+15
NO
read my directions click on the pencil to the right of the box and continue
|dw:1439411604907:dw|
@triciaal helloo?
|dw:1439411682435:dw|
so b
when you distribute you multiply each term inside the parenthesis by what is outside
yes
thanks!
you are welcome

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