How do you combine $(9x^3 -4+x^2+8x) - (7x^3-3x+7)$ ?

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Answer 1 · 2015-07-11T16:24:14

$=color(blue)(2x^3) + x^2 + color(green)(11x) -11$

$(9x^3 - 4 + x^2 +8x ) - (7x^3 -3x+7)$

Combining like terms:

$color(blue)((9x^3 -7x^3)) + color(green)((8x+3x)) + (x^2-4-7)$

$=color(blue)((2x^3)) + color(green)((11x)) + (x^2-4-7)$

$=color(blue)(2x^3) + x^2 + color(green)(11x) -11$

How do you combine (9x^3 -4+x^2+8x) - (7x^3-3x+7)(9x^3 -4+x^2+8x) - (7x^3-3x+7)?