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(x-15)(x+7) = 0
(x-15)=0 (x+7)=0
x1 = 15 x2 = -7
x²-8x-105=0
Podemos usar la fórmula general:
x = -(-8)⁺₋√(-8)²-4(1)(-105)
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2(1)
x = 8⁺₋√64+420
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2
x = 8⁺₋√484
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2
x = 8⁺₋22
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2
x₁ = +15
x₂ = -7
Son las respuestas.