Quadratics
Review question

How do we solve an equation containing three square roots?
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Ref: R5847
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Suggestion

Solve the equation \[ \sqrt{x+4} + \sqrt{x+10} = \sqrt{8x + 18}. \]

Do we know a way of ‘undoing’ square roots?

What happens if we try squaring both sides? Can things be simplified?

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UCLES O level Additional Mathematics 1, QP 471/1, 1970, Q5(ii)

Question reproduced by kind permission of Cambridge Assessment Group Archives. The question remains Copyright University of Cambridge Local Examinations Syndicate (“UCLES”), All rights reserved.

 Last updated 16-Feb-16
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