How do you combine $(-16x^2 + 13x - 13) - (-19x^2 - 11x + 12)$ ?

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Answer 1 · 2015-06-06T22:43:12

Because of the $-$ sign you reverse all the signs in the second term (and of course you change the $-$ into a $+$ :

$=(-16x^2+13x-13)+(19x^2+11x-12)$

Now get rid of the brackets and add like terms:
$=-16x^2+13x-13+19x^2+11x-12$
$=(-16x^2+19x^2)+(13x+11x)+(-13-12)$

$=3x^2+24x-25$

How do you combine (-16x^2 + 13x - 13) - (-19x^2 - 11x + 12)(-16x^2 + 13x - 13) - (-19x^2 - 11x + 12)?