What is the value of a2+b2 if a+b=9 and ab=20
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Answer:
(a+b)²=a²+b²+2ab
(9)²=a²+b²+2×20
81=a²+b²+40
81-40=a²+b²
a²+b²=41
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what is expanded form of a3-b3?
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