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GCSE

Algebra

Question

How do you solve quadratics by 'completing the square'?

2 years ago

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Burdette Kiehn


1 Answer

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Once you have completed the square you have an equation in the form (x-a)^2 = b

You can solve for x by taking the square root of both sides* to get x-a = sqroot(b) or x-a = -sqroot(b)

Then rearrange by adding a to both sides to get two possible values for x.


*remember to use both the positive and the negative square root so that you still get two values of x

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