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Question

What should be subtracted from 4x220x+30 to make it a perfect square?

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Solution

4x220x+30
By using the completing square method,
(2x)22×2x×5+5252+30
(2x5)225+30
(2x5)2+5
5 should be subtracted to make it a perfect square.
(2x5)2+55=(2x5)2

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