a+b=7,ab=5 then a^2+b^2?
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we have to use the identity
(a+b)²=
+2ab
a²+b²=(a+b)²-2ab
= (7)²- 2(5)
= 49-10
= 39
(a+b)²=
a²+b²=(a+b)²-2ab
= (7)²- 2(5)
= 49-10
= 39
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