Which algebraic expression is a polynomial with a degree of 4? a: 5x4 b: x5 – 6x4 14x3 x2 c : 9x4 – x3 – d: 2x4 – 6x4

For polynomials having two or more variables, degree can be of a term or of the polynomial. The degree of a term is the sum of the exponents in a specific term while the degree of a polynomial is the highest value of all the degree of a term in the given polynomial. From the choices given, the algebraic expression with a degree of 4 is option C, 9x^4 – x^3.