x2 - (a + b)x + ab = 0 এর সমাধান সেট নিচের কোনটি?

A {-a, -b}

B {a, -b}

C {a, b}

D {-a, b}

Solution

Correct Answer: Option C

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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