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Put in the - or + values for 4x and 7 is the first step in finding the number needed

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Q: What number must you add to complete the square x2 4x 7?
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What number must you add to complete the square x2 plus 12x equals 40?

You must add 36 to complete the square on the left hand side.You must add 36 to complete the square on the left hand side.You must add 36 to complete the square on the left hand side.You must add 36 to complete the square on the left hand side.


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