Question

A)x²-8+15=0
Qual a resposta?

Answer 1

∆=b²-4.ac
∆=(-8)²-4.1.15
∆=64-60
∆=4
x=-b±√∆
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2.a
x=-(-8)±√4
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2.1
x=8±2
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2
x1=8+2 = 10 =5
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2 2
x2=8-2 = 6 =3
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2 2