Question

Which of the following is a cubic monomial?

• A. $x+5$
• B. $9x^3$
• C. $4x^3+2x+6$
• D. $2x^2+2x+7$

Answer 1

The correct option is B $9x^3$

A polynomial expression which contains only one term is called a monomial.

A polynomial whose degree is equal to 3 is called a cubic polynomial.

$4x^3+2x+6$
is a cubic trinomial as its degree is 3 and it has 3 terms.

$x+5$
is a linear binomial as its degree is 1 and it has 2 terms.

$9x^3$
is a cubic monomial as its degree is 3 and it has only one term.

$2x^2+2x+7$
is a quadratic trinomial as its degree is 2 and it has 3 terms.