Question

resolva a equação de segundo grau -x²+4x-4=0
me ajudeem​

Answer 1

Obs: o número na raiz é delta

$x = \frac{-b +/- \sqrt{b^{2} - 4ac} }{2a} \\\\x = \frac{-4 +/- \sqrt{32} }{2} \\x = \frac{-4 +/- \sqrt{2^{4} vezes 2 } }{2} \\x = \frac{-4 +/- 2^{2}\sqrt{2} }{2} \\x = \frac{-4 +/- 4\sqrt{2} }{2} \\x = \frac{4 (-1 +/- \sqrt{2} }{2} \\x = {2 (-1 +/ \sqrt{2}) \\\\x' = -2 + \sqrt{2} \\\\x'' = -2 - \sqrt{2}$