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X² - 5X - 3X + 15
X(X - 5) -3(X - 5)
(X - 3)(X - 5)
- 3x - 5x + 15
( - 3x ) - ( 5x - 15 )
x ( x - 3 ) - 5 ( x - 3 )
( x - 3 ) ( x - 5 )
x - 3 = 0 atau x - 5 = 0
= 3 atau = 5
HP = { 3,5 }