x2 - x - 12 = 0 সমীকরণের মূলদ্বয় নিচের কোনটি?

A 3,-4

B -3,4

C 3,4

D -3,-4

Solution

Correct Answer: Option B

x2 - x - 12 = 0
⇒ x2 - 4x + 3x - 12 = 0
⇒ x(x - 4) + 3(x - 4) = 0
⇒ (x - 4)(x + 3) = 0

হয়, 
x - 4 = 0 
x = 4

অথবা, 
x + 3 = 0
x = - 3

সমীকরণের মূলদ্বয় 4, - 3

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