Plz help me out with this question. Solve x^2-4x-6=0. It has to be a non calculator method. Thanks.
Then use the completing the square method.Originally Posted by digideens
x^2 -4x -6 = 0
x^2 -4x = 6
x^2 -4x +(-4/2)^2 = 6 +(-4/2)^2
x^2 -4x +4 = 6 +4
(x-2)^2 = 10
Take the square roots of both sises,
x-2 = +,-sqrt(10)
So,
x = 2 +sqrt(10)
or,
x = 2 -sqrt(10)