a-b=6 ve a²+b²=28 ise a.b
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a-b=6
then
(a-b) ka squre karenge
to 36
36=a2+b2-2ab
a2+b2=28
then
36=28-2ab
36-28=-ab
8/2=-ab
4=-ab
ab=-4
I hope u are understand.
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