Question

As raízes reais da equação X2 - 6x + 8 = 0 são?

Me ajudeeeeemmm! !! Por favor! !

Answer 1

Bom Dia !!!

$x^{2} - 6x + 8\\\\Devemos\ achar\ os\ coeficientes\\\\a = 1\\\\b = -6\\\\c = 8\\\\\Delta = b^{2} -4.a.c\\\\\Delta = (-6)^2 - 4.1.8\\\\\Delta = 36 - 32\\\\\Delta = 4\\\\x = \frac{-b\pm\sqrt{4} }{2.a} \\\\x = \frac{6\pm2}{2} \\\\x' = \frac{8}{2} \\\\x' = 4\\\\x" = \frac{4}{2} \\\\x" = 2\\\\s = [4,2]$

Espero ter ajudado :-)

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