The Quadratic Formula – GCSE Maths Revision and Worksheets

What you need to know:

One method of a solving a quadratic equation is by using the quadratic formula. It will not be given to you in an exam, so it is important to both remember the formula itself and know how to use it. Given that a general quadratic equation has the form:

ax^2 + bx + c = 0

the formula, which outputs both solutions for x, is:

x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}

Once you have successfully remembered the formula, then it is simply a matter determining what your a, b, and c are, by reading them off from the equation in question, substituting the values in, and making sure not to make any calculator errors.