Question

04. Resolva as equação 2x2 – 8x + 8 = 0 usando a fórmula de bhaskara, obtemos o a) X1 = -2 e X2 = +2 b) X1 = +2 e x2 = -2 C) X1 = -2 e X2 = -2 d) X1 = +2 e x2 = +2
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Answer 1

Resposta:

D) X1 = +2 e x2 = +2

Explicação passo-a-passo:

$x=\frac{-\left(-8\right)±\sqrt{\left(-8\right)^{2}-4\times 2\times 8}}{2\times 2} \\ x=\frac{-\left(-8\right)±\sqrt{64-4\times 2\times 8}}{2\times 2} \\ x=\frac{-\left(-8\right)±\sqrt{64-64}}{2\times 2} \\ x=\frac{-\left(-8\right)±\sqrt{0}}{2\times 2} \\ x=\frac{8 + - 0}{2\times 2} \\ x = \frac{8 + 0}{4} = \frac{8}{4} = 2 \\ x = \frac{8 - 0}{4} = \frac{8}{4} = 2$