Question

Determine as raízes da equação x² -x-2=0

Answer 1

2^-2*2=0  4-4=0                                                         

Answer 2

$x^2-x-2=0\\ \Delta=(-1)^2-4\cdot1\cdot(-2)\\ =1+8=9\\\\ x=\dfrac{1\pm\sqrt{9}}{2}\\\\ x_1=\dfrac{1+\sqrt{9}}{2}=2\\\\ x_2=\dfrac{1-\sqrt{9}}{2}=-1$