(a) If x + y = 8 and xy = 10, then find x2 + y2, by using formula.
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Step-by-step explanation:
(x+y)² = x² + y² +2xy
(x+y)²-2xy = x²+ y²
A.T.Q
(8)² - 2×10 = x²+y²
64 - 20 =x²+ y²
44 = x²+ y²
Ans = 44
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