যদি a+b=2,ab=1হয় তবে aএবং b এর মান কত?

A    0,2

B    1,1

C    -1,3

D    -3,4

Solution

Correct Answer: Option B

 

a+b = 2 

a = 2 - b

(2 - b)b = 1

2b - b2 = 1

b2 - 2b + 1 = 0

(b-1) 2 = 0

b = 1

substituting b = 1 in any of the given equations gives us 

a+ (1) = 2

a = 1

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