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If f(x) = 2x² - 6x + 8, find f(a - 2).

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Answer: f(a-2) = 2a² - 14a + 28

Explanation:

f(x) = 2x² - 6x + 8

you can take a-2 and substitute it for each x, which would look like this:

f(a-2) = 2(a-2)² - 6(a-2) + 8

then distribute those in ( )

f(a-2) = 2a² - 8a + 8 - 6a + 12 + 8

combine like terms

f(a-2) = 2a² - 14a + 28

User Mike Kinghan
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