X² + X - 72
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x² + x - 72
a + b = 1
ab = 1 ( - 72 ) = - 72
- 1 , 72
- 2 , 36
- 3 , 24
- 4 , 18
- 6 , 12
- 8 , 9
- 1 + 72 = 71
- 2 + 36 = 34
- 3 + 24 = 21
- 4 + 18 = 14
- 6 + 12 = 6
- 8 + 9 = 1
a = - 8
b = 9
( x² - 8x ) + ( 9x - 72 )
x ( x - 8 ) + 9 ( x - 8 )
( x - 8 ) ( x + 8 )
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