Look at the National 4 factorising section before continuing. When a question asks you to 'solve' a quadratic equation, this means that you are to find the roots of the quadratic. In other words ...

Some quadratics cannot be factorised. An alternative method to solve a quadratic equation is to complete the square. To solve an equation of the form \(x^2 + bx + c = 0\) consider the expression ...

The standard equation for a parabola is: You may recognize this as a quadratic function; a parabola is a graphic depiction of a quadratic function. In the equation above, a, b and c are constants ...

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