12 squared plus 18 squared is equal to 468.
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X = √63
If I have this correct you are asking x^2 + 10^2 = 12^2 Then x=6.633249507108
If that's -18y2, the answer is (3x - 2y)(x + 9y)
This is the common form of the Pythagorean Theorem. It describes the relationship between the two legs of a right triangle and the hypotenuse.
18 squared is 324.