Algebra-2

We are looking for two numbers that multiply to c = 20 and add up to b = −9.

The factors of 20 are: 1 × 20, 2 × 10, 4 × 5.

The pair that adds to −9 is −4 + (−5), because −4 × (−5 )= 20 and −4 + (−5)...