Quadratics
Solution by Factorisation
Quadratics
Factorising when A = 0 Factorising when A ≠ 0 Factorising special situations
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Solving quadratic equations
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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.