If f(x)=−6x−3, then how do you find f(2)?

2 Answers
Gió
Jul 2, 2015

f(2)=−15

Explanation:

Substitute 2 instead of x into your function so you get:
f(2)=(−6⋅2)−3=−12−3=−15

Jim H
Jul 2, 2015

Replace every x with 2 and do the arithemetic.

Explanation:

In the definition of this function the variable x is a name for the blank space. (Definition for the rest of this one problem, not for other problems too.)

f(x)=−6(x)−3

To find f(2), replace all of the x'swith 2 and do the arithmetic.

f(2)=−6(2)−3

Now we do the arithmetic:

f(2)=−6(2)−3=−12−3=−15

Here's another example: for the same f, find f(−5)

Solution:
f(−5)=−6(−5)−3

=30−3
=27

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