As you can see, this isn’t the same as the original expression. This is why it’s really important when factorising quadratics to remember two things. One: multiply out the brackets to check ...

The quadratic formula for a quadratic equation in the form of \(ax^2 + bx + c = 0\) is \(x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}\). The first solution is \(x = \frac ...