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HELP ME OUT PLEASE SOLVE IT..............

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2 Answers

You,probably, need to find the composition of functions f(g). If it so, just write
 
1) f(g) = 4g3 = 4(x2 - 8x = 14)3
 
2) f(g) = 2g7 = 2(11x6)7 = 2x117 x42
 
You can write the first function in the expanded form by using cubic formula if you are asked to do so.
This is the way I understood your question.
Ma, please, what am I supposed to do with f(x) and g(x)?  Multiply them? Add them? Subtract them? Divide one by the other?  I need more information.