Quadratics
Solution by Factorisation
Quadratics
Factorising when A = 0 Factorising when A ≠ 0 Factorising special situations

Solving quadratic equations

To solve quadratics in an unfactored form, first the expression must be factorised. Then the null factor law can be used to find the solution(s). When asked to solve a quadratic in factorised form, complete the following:
Step 1: If necessary, rearrange the equation so one side equals zero.
Step 2: Fully factorise the other side.
Step 3: Use the null factor law.
Step 4: Solve the remaining linear equations.
Step 1: If necessary, rearrange the equation so one side equals zero.
Step 2: Fully factorise the other side.
Step 3: Use the null factor law.
Step 4: Solve the remaining linear equations.