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31-12-2015
Mathematics

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Simplify 18 - 2[x + (x - 5)].

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31-12-2015

First, distribute what's inside the parenthesis, and change all the subtractions to addition of negatives.

18 + -2 (x^2 + - 5x)

Next distribute the -2

18 + -2x^2 + 10x

Then I like to rearrange stuff to put it in standard form.

-2x^2 + 10x + 18

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