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1 . x - y = 1; xy = 56 হলে x+y = কত?

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Answer: Option B

Explanation:

X - y = 1
xy = 56
(x - y)^2 = x^2 + y^2 - 2xy
1 = x^2 + y^2 - 112
1 + 112 = x^2 + y^2
x^2 + y^2 = 113
(x + y)^2 = 113 + 112
= 225
x + y = 15