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a=4
b=8
c=-4
Utilizamos formula :
Δ=b²-4ac
Δ=64-(-64)
Δ=128
x₁,₂= -8⁺/₋ √128
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8
x₁,₂= -8⁺/₋ 4√8
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8
x₁,₂= -1 ⁺/- √2