# How much is (-17x^6 - 6x^3 - 20x) + (-10x^4 + 9x^3 - 18)?

Aug 10, 2015

Combining terms with identical exponents of $x$ gives:
$\textcolor{w h i t e}{\text{XXXX}}$$- 17 {x}^{6} - 10 {x}^{4} + 3 {x}^{3} - 20 x - 18$

#### Explanation:

$\left(- 17 {x}^{6} - 6 {x}^{3} - 20 x\right) + \left(- 10 {x}^{4} + 9 {x}^{3} - 18\right)$

{:(=, ,(-17x^6), , ), ( ,+, ,+,(-10x^4)), ( ,+, (-6x^3),+,(+9x^3)), ( ,+, (-20x), , ), (, +, ,+,(-18)) :}

$= - 17 {x}^{6} - 10 {x}^{4} + 3 {x}^{3} - 20 x - 18$