Question

A solução da equação 4x²-x-4=0 é​

Answer 1

$4x^2-x -4=0\\\\x =\frac{-(-1)±\sqrt{(-1)^2-4.4(-4)} }{2.4}\\\\x =\frac{1±\sqrt{1-4.4(-4)} }{2.4}\\\\x = \frac{1±\sqrt{1+64} }{2.4} \\\\x =\frac{1±\sqrt{65} }{2.4}\\\\x = \frac{1±\sqrt{65} }{8(2.4-8)} \\\\x = \frac{1+\sqrt{65} }{8}\\\\x =\frac{1-\sqrt{65} }{8} \\\\x = \frac{1±\sqrt{65} }{8}$