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25 February, 19:05

What number should be added to the expression x^2 + 2x to change it into a perfect square trinomial?

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  1. 25 February, 20:00
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    The answer is (x+1) ² = x²+2x+1

    so x^2 + 2x must be added 1 to become x²+2x+1 = (x+1) ²
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