melisasvr
contestada

given f(x)= 3 square root x-5 , g(x)= x^3+1 find g f(x). Can someone explain to me this question step by step? I don’t know why I’m getting wrong answer pls help!

Respuesta :

5naka

[tex]f(x) = 3 \sqrt{x - 5} \\ g(x) = {x}^{3} + 1 \\ g(f(x)) = g(3 \sqrt{x - 5} )[/tex]

rewrite x in g(x)

[tex] = {(3 \sqrt{x - 5}) }^{3} + 1 \\ = {3}^{3} \times {( \sqrt{x - 5} )}^{3} + 1 \\ = 27(x - 5) \sqrt{x - 5} + 1[/tex]

just observe ?

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