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QUESTION
Q
If xya = (3x + y)2 − (3x − y)2, then the value of a is ?
Solution
xya = (3x + y)2 − (3x − y)2
axy = (9x2 + y2 + 6xy) − (9x2 + y2 − 6xy)
axy = 12xy
a = 12
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