15. If x2 + y2 = 13 and xy = 6, find the value of: x+y
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Answer:
x+y = 5
Step-by-step explanation:
(x+y)² = x²+y²+2xy
(x+y)² = 13+2(6)
(x+y)² = 13+12
(x+y)² = 25
(x+y) = √25
x+y = 5
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