Which expression is a quadratic binomial?

2x4+9x2−6x−1

3x4−2x

7x²

x2−9x

Option D:

Solution:

Binomial is a sum of the two terms.

Quadratic means polynomial having degree 2.

Quadratic binomial:

A polynomial with two terms and degree 2 is called quadratic polynomial.

Option A:

This is a polynomial having degree 4 and 4 terms.

Therefore, it is not a quadratic binomial.

Option B:

This is a polynomial having degree 4 and 2 terms.

Therefore, it is not a quadratic binomial.

Option C:

This is a polynomial having degree 2 and 1 terms.

Therefore, it is not a quadratic binomial.

Option D:

This is a polynomial having degree 2 and 2 terms.

Therefore, it is a quadratic binomial.

Option D is the correct answer.

Hence is a quadratic binomial.

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correct answer:

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