Question

If f(x) = -2|x| + 8, what is f(-18)?

Answer 1

f(-18) means that you must plug -18 in for x and solve like so:

f(x) = -2|-18| + 8

The two bars (| |) on the either side of -18 means "absolute value." This means that you must the number inside the bars positive so...

-2 * 18 + 8

Now to solve this you use the PEMDAS method:

-2 * 18 + 8

-36 + 8

F(-18) = -28

Hope this helped!

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Answer 2

-28.

Explanation:

f(x) = -2|x| + 8,

When x = -18, |x| = 18 (absolute value).

f(-18) = -2*18 + 8

= -36 + 8

= -28.