Question

Which of the following are factor of x2 +4x-21.

Answer 1

Answer :

(x + 7) and (x - 3)

Solution :

• Given polynomial : x² + 4x - 21
• To find : Factors

We have the polynomial x² + 4x - 21 .

Let's factorize the given quadratic polynomial by middle term splitting method .

Thus ,

→ x² + 4x - 21

→ x² + 7x - 3x - 21

→ x(x + 7) - 3(x + 7)

→ (x + 7)(x - 3)

Hence ,

The factors of the given quadratic polynomial are ; (x + 7) and (x - 3) .