F(x)=4x^2+7x-18 find f(-9)

Neon asked Jul 23, 2023

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Neon asked Jul 23, 2023

by Neon

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12 votes

To find f(-9) you have to replace x = -9 into f(x) as follows:

f(x)=4x²+7x-18

f(-9) = 4(-9)² + 7(-9) - 18

f(-9) = 4(81) - 63 - 18

f(-9) = 324 - 63 - 18

f(-9) = 243

Andrew Vershinin answered Jul 30, 2023

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