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Find the sum of the polynomials (5y^3+2y^2-7y) + (12y^3-4y^2+8)

User Marc Young
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(5y^3+2y^2-7y) + (12y^3-4y^2+8)\\\\=5y^3+2y^2-7y+12y^3-4y^2+8\\\\=(5y^3+12y^3)+(2y^2-4y^2)+(-7y)+(8)\\\\=17y^3-2y^2-7y+8

User James McShane
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