Edexcel IGCSE Math A 2.7.A quadratic equations by factorisation

Practise factorised-quadratic questions by reusing the factorisation of x²+bx+c and then setting each bracket equal to zero.

Exam points

Use integer factors of c that add to b, then set each bracket equal to zero.
Follow through from an earlier factorisation and state both roots in simplified form.

[Maximum number: 1]

Hence, solve $y^{2}-10 y+21=0$

Final answer:
3, 7

Follow-through is allowed from factors in the form $(y\pm p)(y\pm q)$ .

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