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It is -13.
x2 + x2 + x2 = (1 + 1 + 1)x2 = 3x2
x2/172 - y2/b2 = 1 for some constant b.
The two binomials can be written as (x - a)(x + a), for any constant a. Proof: Expand using FOIL: (x - a)(x + a) = x2 + xa - xa - a2 Group: (x - a)(x + a) = x2 - a2 x2 - a2 is a difference of squares. Thus, the product of (x - a) and (x + a) is a difference of squares.
If x has the power 2 then you want the integral of x2, I think. When you integrate this you get : x3/3 , plus a constant.