How much is $(5 x^{6} + 9 x^{3} - 6 x) + (- 9 x^{7} - 20 x^{2} - 6 x)$ $(5x^6 + 9x^3 - 6x) + (-9x^7 - 20x^2 - 6x)$ ?

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How much is $(5 x^{6} + 9 x^{3} - 6 x) + (- 9 x^{7} - 20 x^{2} - 6 x)$ $(5x^6 + 9x^3 - 6x) + (-9x^7 - 20x^2 - 6x)$ ?

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Answer 1 · 2015-08-01T00:12:19

$- 9 x^{7} + 5 x^{6} + 9 x^{3} - 20 x^{2} - 12 x$ $-9x^7+5x^6+9x^3-20x^2-12x$

Explanation:

Grouping by powers of $x$ $x$ this could be written as
$XXXX$ $color(white)("XXXX")$ ${: (,,+5x^6,+9x^3,,-6x), (+,-9x^7,,,-20x^2,-6x):}$
$color(white)("XXXX")$ $"-------------------------------------------------------"$
$color(white)("XXXX")$ ${: (" ",-9x^7,+5x^6,+9x^3,-20x^2,-12x) :}$

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How much is $(5 x^{6} + 9 x^{3} - 6 x) + (- 9 x^{7} - 20 x^{2} - 6 x)$ $(5x^6 + 9x^3 - 6x) + (-9x^7 - 20x^2 - 6x)$ ?

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How much is (5x^6 + 9x^3 - 6x) + (-9x^7 - 20x^2 - 6x)(5x6+9x3−6x)+(−9x7−20x2−6x)(5x^6 + 9x^3 - 6x) + (-9x^7 - 20x^2 - 6x)?

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How much is $(5 x^{6} + 9 x^{3} - 6 x) + (- 9 x^{7} - 20 x^{2} - 6 x)$ $(5x^6 + 9x^3 - 6x) + (-9x^7 - 20x^2 - 6x)$ ?