When dealing with quadratics, you will often find that your equation doesn't look like
ax2 + bx + c = 0
It may look more like the following,
4x2 = 5x + 6
In this case you must bring the 5x + 6 to the other side of the equation.
N.B. When you move part of an equation to the otherside of the = sign, you must inverse the sign.
In our case, 4x2 = 5x + 6 becomes,
4x2 - 5x - 6 = 0
A quadratic equation must always be equal to zero before you can find the roots.
Be carefull though, you may get an equation like,
x2 + 6x + 2 = 4
Remember, a quadratic must always equal zero, so you must move the = 4 to the other side of the equation,
x2 + 6x -2 = 0