Question

Ajuda ai por favor Sendo a equação x2 – 3x + 2 = 0, o valor de 5(x’ + x”) é: (10) a) 13 b) 14 c) 15 d) 16 e) nenhuma das alternativas

Answer 1

Boa Tarde !!!

$Resolver\ por\ bh\'askara:\\\\x^{2} - 3x + 2 = 0\\\\\downarrow Coeficientes\downarrow \\\\a = 1\\\\b = -3\\\\c = 2\\\\\Delta = b^{2} -4.a.c\\\\\Delta = (-3)^{2} - 4.1.2\\\\\Delta = 9 - 8\\\\\Delta = 1\\\\x = \frac{-b\pm\sqrt{\Delta} }{2.a} \\\\x = \frac{3\pm\sqrt{1} }{2}\\\\x' = \frac{3-1}{2} \\\\x' = \frac{2}{2} \\\\x' = 1\\\\x" = \frac{3+1}{2} \\\\x" = \frac{4}{2} \\\\x" = 2\\\\s = [1,2]\\\\5(1 + 2)\\\\5 + 10\\\\Resultado = Letra\ c)\ 15$

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