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24 March, 14:25

Which number completes the square? x^2-4x?

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  1. 24 March, 17:01
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    X^2-4x=0 Let x=0 0^2=4 (0) = 0 0=0 [checks out] and x^2-4x=0 (4) ^2-4 (4) x=0 16-16=0 0=0 [also checks out]
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