যদি x-y=1,xy=56 হয় তবে x+y=কত?
Correct Answer: Option C
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
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