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Expanding & Factorising Brackets
A calculator gives the solutions to as and .
Explain why this tells you that can be factorised into double brackets.
Expanding & Factorising Brackets
If the solutions to a quadratic equation are integers or (rational) fractions, then the quadratic factorises.
The solutions are and which are integers or fractions, so it must factorise.
The factorisation is .