The correct option is D 5x3+2x2+9x+6
A polynomial whose degree is equal to 3 is called a cubic polynomial.
The degree of a polynomial is the highest power of the variable in the polynomial.
The degree of the polynomial
4x4+5x3+2x2+9x+6 is 4.
The degree of the polynomial
2x+5 is 1.
The degree of the polynomial
2x2+9x+6 is 2.
The degree of the polynomial
5x3+2x2+9x+6 is 3.