If you mean: x squared -x -56 = 0 then using the quadratic equation formula x = 8 or x = -7
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No, unless "a" happens to be equal to 0, or to 1.
If x squared -10 = 0 then x = the square root of 10
x = -2/3,7/6
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n2 = 10n + 56 Subtract (10n + 56) from each side: n2 - 10n - 56 = 0 Now you have something on the left side that you can factor: (n - 14) (n + 4) = 0 n = +14 n = - 4