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Mathematics
Harold
5 March, 05:54
If f (x) = 2x^2-x, find f (-4) - f (9)
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Gretchen Murphy
5 March, 08:24
0
-117
Step-by-step explanation:
Hello!
If f (x) = 2x^2-x, then f (-4) = 2 (-4) ^2 - (-4) = 2 (16) + 4 = 36, and
f (9) = 2 (9) ^2 - 9 = 153
Therefore, f (-4) - f (9) = 36 - 153 = - 117
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