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Which is equal to 3[f(2x)] for f(x) = 3x^2+3/2?
a.15/2
b. 81/2
c. 9x^2+9/2
d.18x^2+9
 one year ago
 one year ago
bless Group Title
Which is equal to 3[f(2x)] for f(x) = 3x^2+3/2? a.15/2 b. 81/2 c. 9x^2+9/2 d.18x^2+9
 one year ago
 one year ago

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e.mccormick Group TitleBest ResponseYou've already chosen the best response.2
What part of this is giving you trouble?
 one year ago

bless Group TitleBest ResponseYou've already chosen the best response.0
when i try to substitute the f(x) to the 3[f(2x)] i can't get the answer
 one year ago

e.mccormick Group TitleBest ResponseYou've already chosen the best response.2
You substitute 2x into f(x), then multiply through the whole thing by 3.
 one year ago

e.mccormick Group TitleBest ResponseYou've already chosen the best response.2
Hmmm... and yes, if that is written right, I can see why that would not get an answer.
 one year ago

e.mccormick Group TitleBest ResponseYou've already chosen the best response.2
Is it supposed to be \(3[f(2)]\)?? Rather than 2x?
 one year ago

bless Group TitleBest ResponseYou've already chosen the best response.0
the answer is 108x^2 + 9/2?
 one year ago

e.mccormick Group TitleBest ResponseYou've already chosen the best response.2
Yes, as written, \(108x^2 + \cfrac{9}{2}\) would be correct.
 one year ago

Muhammad_Nauman_Umair Group TitleBest ResponseYou've already chosen the best response.1
if u want this answer then u should in question (3x)^2 instead of 3(x^2)
 one year ago

bless Group TitleBest ResponseYou've already chosen the best response.0
well there was another option to solve this problem : if the correct answer is not in the given choices, write you answer
 one year ago

e.mccormick Group TitleBest ResponseYou've already chosen the best response.2
Ah, yes... I see what Muhammad_Nauman_Umair is pointing out.
 one year ago

bless Group TitleBest ResponseYou've already chosen the best response.0
thanks for your help guys @Muhammad_Nauman_Umair and @e.mccormick
 one year ago

e.mccormick Group TitleBest ResponseYou've already chosen the best response.2
\((2x)^2=4x^2\) \(3\times 4x^2=12x^2\) \(3\times 12x^2=36x^2\) Which is what I got the first time... and when you said 108 I thought I had forgotten to multiply by 3.
 one year ago

e.mccormick Group TitleBest ResponseYou've already chosen the best response.2
\(36x^2 + \cfrac{9}{2}\) is what it should be.
 one year ago

Muhammad_Nauman_Umair Group TitleBest ResponseYou've already chosen the best response.1
36x^2+9/2
 one year ago
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