Factorising: WJEC GCSE Higher November 2017 Unit 1 Q8

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Higher November 2017 Unit 1 Q8

WJECHigherCurrent spec3 marksFactorising Solving Quadratics

8. Factorise \(x^2 - 7x - 18\), and hence solve \(x^2 - 7x - 18 = 0\). [3]

Mark scheme

Scheme	Marks	Comments
\((x - 9)(x + 2)\)	B2	B1 for \((x \ldots 9)(x \ldots 2)\).
(\(x\) =) 9 AND (\(x\) =) −2	B1	Strict F.T. from their brackets. Penalise change of letter −1. If no factorising shown, allow the following. B2 for x − 9 (=0) AND x + 2 (=0) (B1) (x =) 9 AND (x =) −2 (B1) B1 for x + 9 (=0) AND x − 2 (=0) (B0) (x =) −9 AND (x =) 2 (B1) FT B1 if only (x =) 9 AND (x =) −2 seen. (B1)