Edexcel IGCSE Math A 2.2.F quadratic factorisation

Practise quadratic-factorisation questions by choosing two integers with the required product and sum, then checking the expanded brackets.

Exam points

Choose factor pairs whose product is c and whose sum gives the x coefficient.
Factorise quadratics with positive or negative constants, then check by expanding.

[Maximum number: 2]

Factorise $y^{2}-10 y+21$

$y^2-10y+21=(y-3)(y-7)$

Final answer:
(y-3)(y-7)

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