Question

1) Resolva as equações de 2° grau:
$x^{2}$x2 - 5x + 6 = 0

Answer 1

$x^2-5x+6=0\\\\x_{1,\:2}=\frac{-\left(-5\right)\pm \sqrt{\left(-5\right)^2-4\cdot \:1\cdot \:6}}{2\cdot \:1}\\\\x_{1,\:2}=\frac{-\left(-5\right)\pm \:1}{2\cdot \:1}\\\\x_1=\frac{-\left(-5\right)+1}{2\cdot \:1},\:x_2=\frac{-\left(-5\right)-1}{2\cdot \:1}\\\\\frac{-\left(-5\right)+1}{2\cdot \:1}\\\\=\frac{5+1}{2\cdot \:1}\\\\=\frac{6}{2\cdot \:1}\\\\=\frac{6}{2}\\\\\frac{6}{2}=\\\\\frac{-\left(-5\right)-1}{2\cdot \:1}\\\\=\frac{5-1}{2\cdot \:1}\\\\=\frac{4}{2}\\\\=2\\\\x=3,\:x=2$