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 one year ago
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
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

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

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

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

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

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

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

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

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

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

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

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

e.mccormick
 one year ago
Best 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.

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

Muhammad_Nauman_Umair
 one year ago
Best ResponseYou've already chosen the best response.136x^2+9/2
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