x2 - (a + b)x + ab = 0 সমীকরণের সমাধান সেট হবে-

A {a, b}

B {a, - b}

C {- a, b}

D {- a, - b}

Solution

Correct Answer: Option A

দেওয়া আছে,
x2 - (a + b)x + ab = 0
⇒ x2 - ax - bx + ab = 0
⇒ x(x - a) - b(x - a) = 0
∴ (x - a) (x - b) = 0

এখন,
x - a = 0
∴ x = a

আবার,
x - b = 0
∴ x = b

∴ x = {a , b}

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