Question

Ecuación X^2-5X+4 =0 mediante la fórmula general

Answer 1

$x1.2 = \frac{ - b + - \sqrt{ {b}^{2} - 4ac} }{2a} \\ x1.2 = \frac{ - ( - 5) + - \sqrt{ - {5 }^{2} - 4(1)(4) } }{2} \\ = \frac{5 + - \sqrt{9} }{2} \\ x1 = \frac{5 + \sqrt{9} }{2} = \frac{8}{2} = 4 \\ x1 = 4 \\ x2 = \frac{5 - \sqrt{9} }{2} = \frac{2}{2} = 1 \\ x2 = 1$