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a= -4
b= 1,5
c= -13
x= -1,5 ±√(1,5)^2 -4 (-4×-13) /2×(-4)
x= -1,5 ±√2,25 - 208 / -8
x= -1,5 ±√ -205,75 /-8
x= -1,5 ± 14,34 /-8
x= -1,5 + 14,34 /-8 x= -1,5 - 14,34 /-8
x= 12,84/-8 x= -15,84/-8
x= -1,6 x= 1,98