Question

Resolva a equação: x2 -3x -4 = 0

Answer 1

Resposta:

x1 = 4   e x2 = -1

Explicação passo-a-passo:

x² -3x -4 = 0 => Δ = b²-4ac =>  Δ = (-3)²-4(1)(-4) =>   Δ = 9 + 16 => Δ = 25

x = -b± √Δ/2a=> x = 3± 5/2(1)=>  x = 3± 5/2 => $x_{1} = \frac{3 + 5}{2} => x_{1} = \frac{8}{2} => x_{1} = 4\\\\x_{2} = \frac{3 - 5}{2} => x_{2} = \frac{-2}{2} => x_{2} = -1$

Answer 2

Resposta:

x=4ex2=-1

Explicação passo-a-passo:

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