Answer:
15x^2+8x-8
Explanation:
when asking for the sum of 2 polynomials, the question is simply asking you to add like terms
15x^2 (nothing to add so this stays the same)
3x+5x=8x
-4+(-4)=-8
add the bolded terms to get
Answer: 15x^2 + 8x - 8
1) Add them together
(15x^2 + 3x - 4) + (5x - 4)
2) Combine like terms
15x^2 + 8x - 8
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