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    Melogie00's Avatar
    Melogie00 Posts: 1, Reputation: 1
    New Member

    Sep 19, 2018, 01:43 AM
    Determine what number should be added to complete the square of this equation: x^2-4x
    what number should be added to complete the square using: x^2-4x
    ebaines's Avatar
    ebaines Posts: 12,132, Reputation: 1307

    Sep 19, 2018, 05:51 AM
    Given an equation of the form x^2+Ax=0, you complete the square by dividing value of the coefficient of x by 2 and squaring it, which gives you (A/2)^2. Here’s an example: given x^2 - 10x, you have A= -10, so you complete the square by adding (-10/2)^2 = (-5)^2 = 25. You end up with x^2-10x+25, which factors to (x-5)^2. Now apply this method to your problem, and feel free to post your answer back here.

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