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HELP: Math paper 0580_s11_qp_22.

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How do you do 19 c. Find fg(x + 1) in its simplest form. Please help me. I have lost touch in math now.
 
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f(x) = x^2
g(x) = 2^x

f(2^x) = (2^x)^2=2^(2x)
fg(x)= 2^(2x)
fg(x+1) = 2^2(x+1) Answer
 
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