15.If x= √+√−and y = √−√+, find the value of x² + xy -y².
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Step-by-step explanation:
first condition
sub √+ &√-
x= √+√- =0
value of x= 0
seconde condition
sub √- &√+
y= √+√- =0
value of y =0
put x =0 and y= 0 in equation
x square + xy - y square
0+0×0-0
=0
the value is 0
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