Grigori S. answered • 09/02/14
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Certified Physics and Math Teacher G.S.
1) f(g(x)) = g^4 +5g = (7x^3) ^4 + 5(7x^3) = (7^4) x^12 + 35x^3 = 2401 x^12 + 35 x^3
2)g(f(x)) = 7f^3 = 7 (x^4 +5x)^3
Grigori S.
No problem! Just substitute x by t wherever you need and rewrite it again.
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09/02/14
Gabriela A.
09/02/14