# How do you factor #2d^2+4d-126#?

##### 1 Answer

Jul 27, 2016

2(d - 7)(d + 9)

#### Explanation:

To factor y, find 2 numbers, having opposite signs, knowing sum (b = 2) and product (c = -63)

Factor pairs of (-63) --> (-3, 21)(-7, 9). This last sum is 2 = b. There for,

the 2 numbers are -7 and 9.