How do you evaluate #abs(12-4)-abs(-8+8)-1#?

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Answer 1 · 2016-12-01T11:50:00

7

The vertical lines with something in between is called an Absolute value, which is always positive.

So for example #|-3| = 3#

Thus: #|12-4| = +8#

And: #|-8+8| = +0#

But #-|8-8| = -(|8-8|) = -(+0) = -0#

#color(blue)("Putting this all together")#

#|12-4|-|-8+8|-1" "=" "8-0-1 = 7#