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= 8x² +15x -8x -15
= (8x² +15x) -(8x +15)
= x(8x +15) -1(8x +15)
= (x -1) (8x +15)
Itu jawabannya.
( 8x+15 ) (x-1)
8x+15=0
x=-15/8
atau
x-1=0
x=1
Nilai x= 1 atau x=-1 7/8