if x ¤ y = ( x + y ) ^ 2 - ( x - y ) ^ 2. then √ 2 ¤ √ 2 =	Choose the correct choice from the following
A) 0  B) 8  C) 10  D) 15  E) 20
<gadget id="calculator">2 ** (1/2)</gadget>
<output>sqrt(2) = around 1.414214</output>

<gadget id="calculator">(sqrt(2)) + (sqrt(2))</gadget>
<output>2*sqrt(2) = around 2.828427</output>

<gadget id="calculator">(2*sqrt(2)) ** 2</gadget>
<output>8</output>

<result>B</result>
if x ¤ y = ( x + y ) ^ 2 - ( x - y ) ^ 2. then √ 2 ¤ √ 2 =
power(add(sqrt(2), sqrt(2)), 2)
"x = √ 2 and y also = √ 2 applying the function ( √ 2 + √ 2 ) ^ 2 - ( √ 2 - √ 2 ) ^ 2 = ( 2 √ 2 ) ^ 2 - 0 = 4 x 2 = 8 . note : alternative approach is the entire function is represented as x ^ 2 - y ^ 2 = ( x + y ) ( x - y ) which can be simplified as ( x + y + x - y ) ( x + y - ( x - y ) ) = ( 2 x ) ( 2 y ) = 4 xy . substituting x = √ 2 and y = √ 2 you get the answer 8 . answer b"