Let f(x) = 7x^2+5 and g(x) = x-3, how do

Emerson Barnes

Emerson Barnes

Answered question

2022-01-25

Let f(x)=7x2+5 and g(x)=x3, how do you find the composite function (fg)(2)?

Answer & Explanation

Rosa Nicholson

Rosa Nicholson

Beginner2022-01-26Added 13 answers

first you have to find what f(x) is in order to get g(x) so in order to get that, you have to first find what f(2) is and you do it like this: f(x)=7(2)2+5 the 2 replaces x 33 and now you have to find what g(x) is so you have to take 33 and you get g(x)=333 and you get your answer
porekalahr

porekalahr

Beginner2022-01-27Added 10 answers

To find a composite function, you simply insert g(x) into f(x) anywhere you would find the x variable:
f(g(x))=7(x3)2+5
=7(x26x+9)+5
=7x242x+63+5
=7x242x+68

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