If f(x) = x^2 + 9x, find f(a - 4)

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asked Jul 5, 2018 32.4k views

1 Answer

Kaaf · Answer 1 · 2018-07-09T23:02:33+0000

To solve this, you plug a-4 in wherever you see an x
f(a-4)=(a-4)(a-4)+9(a-4)
Then you distribute to simplify
=a^2-4a-4a+16+9a-36
=a^2+a-20

Hope this helps

If f(x) = x^2 + 9x, find f(a - 4)

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