-Is there a difference between the sum of the squares of (- 3) and - (- 3)

-Is there a difference between the sum of the squares of (- 3) and - (- 3)

There is a difference
(-3)²=9
-3²=-9

(1) The sum of two times of a and the opposite number of B can be expressed as? (2) the sum of the squares of X and two numbers can be expressed as?

(1)2a+(-b)=2a-b
(2) Is it the sum of the squares of X and y
x²+y²

We know that the sum of squares of two numbers is equal to the total sum of squares of two numbers plus a, and it is also equal to the total difference of squares of two numbers minus B?

Let two numbers be x and Y respectively
Then x2 + y2 = (x + y) 2 + a = (X-Y) 2-B
a=-2XY,b=-2XY
So a = b = two times the sum of two numbers
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