Question

x² + 9x + 20 is equal to ______.

विकल्प

• (x + 4) (x + 5)

• (x + 4) (х – 5)

• (x + 2) (x + 10)

• (x + 10) (х – 2)

Answer 1

x² + 9x + 20 is equal to (x + 4) (x + 5).

Explanation:

The quadratic expression x² + 9x + 20 can be factored by finding two numbers that multiply to 20 and add to 9. 

These numbers are 4 and 5.

Hence, x² + 9x + 20 = (x + 4)(x + 5).