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Brooke2013
 2 years ago
Let f(x) = x^2 + 6 and g(x) = x+8/x. Find (g times f)(7)
Choices :)
A.) 55/7
B.) 384/7
C.) 295/49
D.) 63/55
Brooke2013
 2 years ago
Let f(x) = x^2 + 6 and g(x) = x+8/x. Find (g times f)(7) Choices :) A.) 55/7 B.) 384/7 C.) 295/49 D.) 63/55

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zepdrix
 2 years ago
Best ResponseYou've already chosen the best response.1Are you sure it's "times", or is it the open circle? Which tells us that it's a composition of functions :D

Brooke2013
 2 years ago
Best ResponseYou've already chosen the best response.0It's an open circle, I looked at it wrong.

zepdrix
 2 years ago
Best ResponseYou've already chosen the best response.1dw:1353198866293:dw Ok take a look at this a sec, see if it makes sense or not.. so hmmm to finish this off, we'll need to figure out what f(7) is.

Brooke2013
 2 years ago
Best ResponseYou've already chosen the best response.0How do you figure that out ?

zepdrix
 2 years ago
Best ResponseYou've already chosen the best response.1\[\large f(x)=x^2 + 6\]\[\huge f(7)=(7)^2+6\]

Brooke2013
 2 years ago
Best ResponseYou've already chosen the best response.0so the answer to f(7) is 55

zepdrix
 2 years ago
Best ResponseYou've already chosen the best response.1Yah looks good c: So now we plug that value into g!

Brooke2013
 2 years ago
Best ResponseYou've already chosen the best response.0is the answer B, 384/7

zepdrix
 2 years ago
Best ResponseYou've already chosen the best response.1\[f(7)=55\]\[\huge g(f(7))=\frac{ f(7)+8 }{ f(7) }=\frac{ 55+8 }{ 55 }\]

Brooke2013
 2 years ago
Best ResponseYou've already chosen the best response.0So the answer is D 63/55 :) Thank you so much
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