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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
 one year ago
 one year 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
 one year ago
 one year ago

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

Brooke2013Best ResponseYou've already chosen the best response.0
It's an open circle, I looked at it wrong.
 one year ago

zepdrixBest ResponseYou've already chosen the best response.1
dw: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.
 one year ago

Brooke2013Best ResponseYou've already chosen the best response.0
How do you figure that out ?
 one year ago

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

Brooke2013Best ResponseYou've already chosen the best response.0
so the answer to f(7) is 55
 one year ago

zepdrixBest ResponseYou've already chosen the best response.1
Yah looks good c: So now we plug that value into g!
 one year ago

Brooke2013Best ResponseYou've already chosen the best response.0
is the answer B, 384/7
 one year ago

zepdrixBest ResponseYou've already chosen the best response.1
\[f(7)=55\]\[\huge g(f(7))=\frac{ f(7)+8 }{ f(7) }=\frac{ 55+8 }{ 55 }\]
 one year ago

Brooke2013Best ResponseYou've already chosen the best response.0
So the answer is D 63/55 :) Thank you so much
 one year ago
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