How do you simplify $(-9x^2 - 4x - 4) - (-9x^2 - 11x + 12)$ ?

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Answer 1 · 2015-06-18T16:09:54

$=color(blue)(7x -16$

$(-9x^2 - 4x - 4) - (-9x^2 - 11x + 12)$

$=-9x^2 - 4x - 4 +9x^2 + 11x - 12$

Grouping like terms:
$=color(red)((-9x^2 +9x^2)) +color(blue)((-4x + 11x)) -4 - 12$
$=0 +color(blue)(7x) -16$
$=color(blue)(7x -16$

How do you simplify (-9x^2 - 4x - 4) - (-9x^2 - 11x + 12) (-9x^2 - 4x - 4) - (-9x^2 - 11x + 12)?