alonapopovych2005 alonapopovych2005

10-01-2020
Mathematics

contestada

What is the value of f ( − 3a ), if f ( x ) = 2x 2 + 6x ?

Select one: a. 18a 2 - 9a
b. 18a 2 - 18a
c. 9a 2 - 18a
d. 18a - 6a

Respuesta :

10-01-2020

Answer:

b. 18a² - 18a

Step-by-step explanation:

[tex]f(x)=2x^2+6x\\\\f(-3a)\to\text{substitute}\ x=-3a\ \text{into}\ f(x):\\\\f(-3a)=2(-3a)^2+6(-3a)=2(-3)^2a^2-18a=2(9)a^2-18a=18a^2-18a[/tex]

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