Question

please answer this question please
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Answer 1

xy=(√7+√5)(√7-√5)

xy=7-5

=2

x^2+y^2= 7+5+2√35+7+5-2√35

14+10=24

(x^2-y^2)2=7+5+2√35-7-5+2√35

=(4√35)2

16.35=560

Answer 2

hope this helps you