evaluate the polynomial when x= -1, y=2, z=3

12^4y^2z+8x^3y-11x^7y+5x^5yz^2

solve
(5x^2y^5-13x^3y^3+8x^4y)-(-17y^5x^2+6x^3y^3+15yx^4-2xy^3)


(3/7x^4+3/4x^3-1/5x+3/8)+(1/