a + b = 7 এবং ab = 10 হলে (a – b) = কত?
A 4
B 3
C 2
D 8
Solution
Correct Answer: Option B
আমরা জানি,
(a – b)2 = (a + b)2 - 4ab
= 72-4.10 = 49 - 40 = 9
⇒ (a – b)2 = 33
⇒ a – b= 3
(a – b)2 = (a + b)2 - 4ab
= 72-4.10 = 49 - 40 = 9
⇒ (a – b)2 = 33
⇒ a – b= 3
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