Question

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x² - 8x + 12 = 0

Answer 1

Resposta:

S = {2; 6}

Explicação passo a passo:

$x^{2} -8x+12=0\\\\\\x=\frac{-(-8)\pm\sqrt{(-8)^{2} -4(1)(12)} }{2(1)} \\\\\\x=\frac{8\pm\sqrt{64 -48} }{2} \\\\\\x=\frac{8\pm\sqrt{16} }{2} \\\\\\x=\frac{8\pm\sqrt{4^{2} } }{2} \\\\\\x=\frac{8\pm4 }{2} \\\\\\x=4\pm2 \\\\\\\\\\x'=4-2\\\\\\\bold{x'=2}\\\\\\\\\\x''=4+2\\\\\\\bold{x''=6}$