Question

calcule as raízes das equações X2 - x - 2 = 0


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Answer 1

Resposta:

2 e -1

Explicação passo-a-passo:

Answer 2

Resposta:

Explicação passo-a-passo:

x² - x - 6 = 0

a = 1

b = -1

c = -2

$\Delta=b^2-4ac\\\Delta=(-1)^2-4.1.(-2)\\\Delta=1+8\\\Delta=9\\x=\frac{-b-\sqrt{\Delta} }{2a}\\ou\\x=\frac{-b+\sqrt{\Delta} }{2a} \\\\x=\frac{-(-1)-\sqrt{9} }{2.1} \\x=\frac{1-3}{2} \\x=\frac{-2}{2}\\x=-1\\ou\\x=\frac{-(-1)+\sqrt{9} }{2.1} \\x=\frac{1+3}{2} \\x=\frac{4}{2}\\x=2\\S={\left\{\--1,2\}$}