Question

please tell me please tommorow is my final exam i have dout about this
i have no tution please tell​

Answer 1

15x^3-y^3+17x^y+xy^2

Answer 2

Answer:

7) (5x-y)(3x^2+4xy+y^2)

15x^3+20x^2y+5xy^2-3x^2y-4xy^2-y^3

15x^3+17x^2y+xy^2-y^3