if x ¤ y = ( x + y ) ^ 2 - ( x - y ) ^ 2. then √ 7 ¤ √ 7 =  Choose the correct choice from the following answers:
A) 0
B) 5
C) 10
D) 15
E) 28
<gadget id="calculator">7 ** (1/2)</gadget>
<output>sqrt(7) = around 2.645751</output>

<gadget id="calculator">(sqrt(7)) + (sqrt(7))</gadget>
<output>2*sqrt(7) = around 5.291503</output>

<gadget id="calculator">(2*sqrt(7)) ** 2</gadget>
<output>28</output>

<result>E</result>
if x ¤ y = ( x + y ) ^ 2 - ( x - y ) ^ 2. then √ 7 ¤ √ 7 =
power(add(sqrt(7), sqrt(7)), 2)
"x = √ 7 and y also = √ 7 applying the function ( √ 7 + √ 7 ) ^ 2 - ( √ 7 - √ 7 ) ^ 2 = ( 2 √ 7 ) ^ 2 - 0 = 4 x 7 = 28 . 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 = √ 7 and y = √ 7 you get the answer 28 . answer e"