A student attempts to solve the equation |3x + 4| = x. The student writes the following

Question:

A student attempts to solve the equation |3x + 4| = x. The student writes the following working:

Explain the error made by the student.

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Pearson Edexcel A Level Mathematics Pure Mathematics Year 2

ISBN: 9781292183404

1st Edition

Authors: Greg Attwood, Jack Barraclough, Ian Bettison, David Goldberg, Alistair Macpherson, Joe Petran

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Question Posted: Aug 08, 2023 03:24 AM

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A student attempts to solve the equation |3x + 4| = x. The student writes the following

Question:

3x + 4 = x 4 = 2x x = -2 or -(3x + 4) = x -3x 4 = x -4 = 4x x = -1 Solutions are x = -2 and x = -1. -

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Pearson Edexcel A Level Mathematics Pure Mathematics Year 2

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