Separate monomials, binomials, trinomials and polynomials from the following algebraic expressions :
8 –3x, xy^{2}, 3y^{2 }– 5y + 8, 9x – 3x^{2} + 15x^{3} – 7,
3x × 5y, 3x ÷ 5y, 2y ÷ 7 + 3x – 7 and 4 – ax2 + bx + y
Monomials are: xy^{2}, 3x × 5y, 3x ÷ 5y;
Bionomials are : 8 – 3x
Trinomials are : 3y^{2} – 5y + 8, 2y ÷ 7 + 3x – 7
Polynomials are: 8 – 3x, 3y^{2} – 5y + 8, 9x – 3x^{2} + 15x^{3} – 7, 2y ÷ 7 + 3x – 7, 4 – ax^{2 }+ bx + y