Factorising: WJEC GCSE Intermediate November 2017 Unit 1 Q15

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Intermediate November 2017 Unit 1 Q15

WJECIntermediateCurrent spec3 marksFactorising Solving Quadratics

15. 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 ... 9)(x ... 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)