Expanding Brackets: WJEC GCSE Higher November 2019 Unit 2 Q10

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Higher November 2019 Unit 2 Q10

WJECHigherCurrent spec3 marksExpanding Brackets Factorising

10. Simplify, and then factorise, the following expression. [3]

\[k(9k - 1) + k - 25n^2\]

Mark scheme

Scheme	Marks	Comments
\(9k^2 - 25n^2\)	B1	Allow \(9k^2 - k + k - 25n^2\) ISW.
\((3k + 5n)(3k - 5n)\)	B2	B1 for \((3k \ldots 5n)(3k \ldots 5n)\) Mark final answer. Ignore \((3k - 5n)(3k + 5n) = 0\), but penalise -1 for further work e.g. \((3k - 5n) = 0\) or \((3k + 5n) = 0\).