Answer
$x^5+8x^4+6x^3-2x-9$
Work Step by Step
Add the polynomials then combine like terms to obtain:
$=8x^4-x^3+x-4+x^5+7x^3-3x-5
\\=x^5+8x^4+(-x^3+7x^3)+(x-3x)+(-4-5)
\\=x^5+8x^4+6x^3+(-2x)+(-9)
\\=x^5+8x^4+6x^3-2x-9$
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