Question

How do you factor n^2 - n-72

Answer 1

Consider the form

x

2

+

b

x

+

c

. Find a pair of integers whose product is

c

and whose sum is

b

. In this case, whose product is

−

72

and whose sum is

−

1

.

−

9

,

8

Write the factored form using these integers.

(

n

−

9

)

(

n

+

8

)

Explanation: