x2-x-56 = (x+7)(x-8) when factored
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35 squared = 35 x 35 = 1225 56 squared = 56 x 56 = 3136
If you mean: x squared -x -56 = 0 then using the quadratic equation formula x = 8 or x = -7
56
By "squared", I'm certain you mean the 562, correct? If that's what you mean, then the answer to that is 75,264. The small 2 means that you multiply that number by itself, so 56x 56=3136, and 3136 x 24=75,264.
If by area you mean X*Y it would be -49 (or 49, if you assume area to be positive). (X=7, Y=-7) when X+Y^2=56 and X+Y=0.