write this in long division topic Dividing Polynomials 1. (x^2+2x-15)÷(x+7) 2.(2x^2+11x-21)÷(x+7) 3.(x^4-4y^2-5)÷(y^2-5) 4.(6x^3-23x^2+16x-3)÷(3x-1) 5.(3x^3+2x-4)÷(x+2)​