Question

Identify the cubic polynomials among the following.

1. $2x^3+3x^2+2x+1$

2. $x^3+2x+3$

3. $\sqrt{3}x+5$

4. $y+\sqrt{2}$

• A. 1,2 and 3
• B. 3 and 4
• C. 2 and 3
• D. 1 and 2

Answer 1

The correct option is D

1 and 2

For a cubic polynomial, the degree of the variable in the polynomial should be 3.

1. $2x^3+3x^2+2x+1$ – Degree of x is 3. So, cubic polynomial

2. $x^3+2x+3$ – Degree of x is 3. So, cubic polynomial.

3. $\sqrt{3}x+5$ – Degree of x is 1 – Linear polynomial.

4. $y+\sqrt{2}$ – Degree of y is 1 – Linear polynomial.