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bless
 2 years 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
bless
 2 years 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
 2 years ago
Best ResponseYou've already chosen the best response.2What part of this is giving you trouble?

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

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

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

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

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

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

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