Let f(x)=4x+5 and g(x)=4x^2-5

Alvaro Wilkinson

Alvaro Wilkinson

Answered question

2022-12-31

Let f(x)=4x+5andg(x)=4x25. What is (fg)(x1)?

Answer & Explanation

wachen42u

wachen42u

Beginner2023-01-01Added 5 answers

So, solution is:
evaluate  (fg)(x)=f(x)×g(x)
(4x+5)(4x25)=16x3+20x220x25
to evaluate  (fg)(x1)
substitute  x=x1  into  (fg)(x)
=16(x1)3+20(x1)220(x1)25
=16(x33x2+3x1)+20(x22x+1)20x+2025
=16x348x2+48x16+20x240x+2020x5
=16x328x212x1

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