1) F'(x) =(x^4)'*f'(x^4) =4*x^3*f'(x^4)
therefor
F'(a) =4(a^3)f'(a^4)=4*10*15=600
2) G(x)=[f(x)]^4
G'(x) =4[f(x)]^3*f'(x)
G'(a) =4[f(a)]^3*f'(a)
=(4)(3^3)(13)
=1404
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Answers & Comments
1) F'(x) =(x^4)'*f'(x^4) =4*x^3*f'(x^4)
therefor
F'(a) =4(a^3)f'(a^4)=4*10*15=600
2) G(x)=[f(x)]^4
G'(x) =4[f(x)]^3*f'(x)
G'(a) =4[f(a)]^3*f'(a)
=(4)(3^3)(13)
=1404