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3x²-14x+5
↓ ↓ ↓
a b c
Formula: x₁,₂= -b ⁺/⁻
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2a
x₁,₂=-(-14) ⁺/⁻
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2(3)
x₁,₂=14+/- √136
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6
x₁,₂=7⁺/-√34
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3
Rpta: x₁,₂=7⁺/-√34
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3
Suerte y saludos !!