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25-02-2020
Mathematics

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Help please !
Evaluate f(-1) using substitution f(x)=2x^3-3x^2-18x-8

Respuesta :

25-02-2020

Answer:

5

Step-by-step explanation:

[tex]f(x) = 2x^3 - 3x^2 -18x - 8\\f(-1) = 2 (-1)^3 - 3(-1) ^2 -18(-1) -8\\f(-1) = 2(-1) -3(1) -18(-1) -8\\f(-1) = -2 -3+18 -8\\f(-1) = 5[/tex]

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