Add:
a)2x2 - 4x - 5 and 3x2 - 9x - 6
b) 9x3 + 3x2 - 8x - 16 and 5x - 22
c)7x* - 7x3 + 7x2 + 2x and -5x4 + 7x3 + 5x2 - 9
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a)2x^2-4x-5+(3x^2-9x-6)
=5x^2-13x-11
b)9x^3+3x^2-8x-16+(5x-22)
= 9x^3+3x^2-3x-38
c) 7x^4-7x^3+7x^2+2x+(-5x^4+7x^3+5x^2-9)
= 2x^4+12x^2+2x-9
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