Question

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

Answer 1

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