1) x=-2,6, x= 17
2) x²-8x+15=0
D= 64-60= 4
x1= (8+2)/2= 5
x2= (8-2)/2= 3
x=5, x=3
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1) x=-2,6, x= 17
2) x²-8x+15=0
D= 64-60= 4
x1= (8+2)/2= 5
x2= (8-2)/2= 3
x=5, x=3