It is the Cartesian equation of an ellipse.
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9 plus 16=25 3 squared is the same as 3 times three and 4 squared is the same as 4 times 4 3 times 3 + 4 times 4 9 plus 16 = 25
2.5 + 3.4 Pythagorean Theorem?
The length of side A squared plus the length of side B sqaured equals the missing side of the triangle squared. So i.e. if side A is 4 and side B is 3 then 4x4 which is 16 plus 3x3 which is 9 equals 25 and the square root of 25 equals 5. So in conclusion the missing side equals 5.
this is a pythagorean triple and c2=169 so c=13 25+144=169=132
This kind of question needs to be more specific. It can be read either as (3x5)2 or as 3 x 52. In the first case we have 152 which equals 225. In the second case we have 3 x 25 = 75.