Question

Quais são as raízes da equação x² – 5x + 4 = 0? me ajudem por favor ​

Answer 1

Resposta:

$x^2-5x+4=0\\\\x_{1,\:2}=\frac{-\left(-5\right)\pm \sqrt{\left(-5\right)^2-4\cdot \:1\cdot \:4}}{2\cdot \:1}\\\\x_{1,\:2}=\frac{-\left(-5\right)\pm \:3}{2\cdot \:1}\\\\x_1=\frac{-\left(-5\right)+3}{2\cdot \:1}\\\\\:x_2=\frac{-\left(-5\right)-3}{2\cdot \:1}\\\\x=4\\\\\:x=1$