x2 = 6482 = 64x = 8
x: x2 - 81 = 0
please help on this x2+6x+27=
x2+7x+12
x2-64 = (x-8)(x+8)
it is not an equation (there no equality in it!)
x=18
do you mean, x2 = n?? Take the square root.
You cannot, in general, solve one equation with two unknown variables. x - y = x - x2 Subtract x from both sides: - y = - x2 Change signs: y = x2 And that is as far as you can go.
Divide both sides of the equation by x: x2 = 9x x2 / x = 9x / x x = 9
144X = X2 144X - X2 = 0 (144 - X)X = 0 X = 0 or X = 144
The quadratic formula cannot be used to solve an equation if the coefficient of the equation's x2-term is 0.