if x+y=9 and xy=16 find the value of (x2+y2)
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Step-by-step explanation:
(x + y)² = x² + 2xy + y²
9² = x² + 2xy + y²
81= x² + 2xy + y²
(x²+y²)+2xy=81
(x²+y²)=81-2xy
(x²+y²)=81-2(16)
(x²+y²)=81-32
(x²+y²)=49
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