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22x = 10x + 12x
gantikan 22x diatas ke pers :
(8 x² +10x)+(12x+15)
=2x(4x+5)+3(4x+5)
=(2x+3)(4x+5)
jadi faktor dari
8x² + 22x + 15 =(2x+3)(4x+5)