# SOLUTION: What number should be added to complete the square of the expression? x^2-1/3x

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 Click here to see ALL problems on Expressions-with-variables Question 224086: What number should be added to complete the square of the expression? x^2-1/3xFound 2 solutions by rapaljer, MathTherapy:Answer by rapaljer(4670)   (Show Source): You can put this solution on YOUR website!The rule, if the coefficient of the x^2 term is 1, is to take HALF of the middle term coefficient, and SQUARE it! In this case, take half of -1/3, and square it, which gives you 1/9. R^2 Answer by MathTherapy(1817)   (Show Source): You can put this solution on YOUR website!What number should be added to complete the square of the expression? x^2-1/3x You take of "b," which happens to be of , wich equals . You square this fraction to get: , which you then add.