Question

Resolva a questão do 2° grau -x² + 2x +8 = 0

Answer 1

∆= 4+32=36

x=-2±√∆
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2a

x=-2±6/-2


x'=-4
x''=2

Answer 2

∆=-2²-4.(-1).8=4+32=36
x=-2±√36= -2±6= x1= 4/-2=-2 =x2=-8/-2=+4
2.(-1). -2