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× la puterea 2 plus2×-8

Răspuns :


[tex] {x}^{2} + 2x - 8 = 0[/tex]
∆ = 2²-4×1×(-8)=4+32=36
[tex]x1 = \frac{ - 2 - \sqrt{36} }{2} = \frac{ - 2 - 6}{2} = \frac{ - 8}{2} = - 4[/tex]
[tex]x2 = - \frac{ - 2 + \sqrt{36} }{2} = \frac{ - 2 + 6}{2} = \frac{4}{2} = 2[/tex]