Gee1111
Gee1111
11-03-2017
Mathematics
contestada
If f(x) = x^2 + 9x, find f(a - 4)
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sdmatera
sdmatera
11-03-2017
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
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