4400 Higher November 2008 Paper 4 Q13 – Westie's Workshop

4400 Higher November 2008 Paper 4 Q13

EdexcelHigherOld spec5 marksSolving Quadratics Solving Simple Equations

13

(a) Solve \(x^2 + 2x - 1 = 0\)
Give your solutions correct to 3 significant figures.
You must show sufficient working. (3)

(b) Solve \(\dfrac{2}{y + 4} = 3\)
You must show sufficient working. (2)

Mark scheme (a)

Scheme	Marks
\(\dfrac{-2 \pm \sqrt{2^2 - 4 \times (-1)}}{2}\)	M1
\(\dfrac{-2 \pm \sqrt{8}}{2}\) or better	A1
\(x = -2.41\) or 0.414	A1
	(3)

Notes

M1: allow ... \(4 \times -1\)

A1: or \(-1 \pm \sqrt{2}\)

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