How did they get the -5? I got -3

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asked Jul 16, 2019 104k views

1 Answer

Seva Kalashnikov · Answer 1 · 2019-07-21T01:51:52+0000

f(x) = x² - 3x
g(x) = √x - 1

f(g(x))= (√x - 1)² - 3(√x - 1) = (√x - 1)(√x - 1 - 3) =(√x - 1)(√x - 4) =
= √x √x -1*√x -4*√x +4 = x -5√x +4

Answer: x -5√x +4

How did they get the -5? I got -3

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