FACTORIZING 10

Solve by Factorization 2x² - 3x - 20

Solution

2x² - 3x – 20=0  We split the middle term (-3x) to be (-8x + 5x).

2x² - 8x + 5x – 20=0                (-3x) = -8x + 5x.

(2x² -8x) + (5x - 20)=0

2x(x - 4) + 5(x - 4)=0

(2x + 5) (x -4) =0

2x + 5=0 or x -4=0

2x = -5  or  x = 4

2       2

x = ^-5/2  or  x = 4

Hence x= ^-5/2 or x=4 answer.

TRY THIS…..

 Solve by factorization; 2x² - x – 28.