x² - (a + b)x + ab = 0; x = ?

A a, b

B a

C b

D ab

Solution

Correct Answer: Option A

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

x - a = 0
⇒ x = a

অথবা, x − b = 0
⇒ x = b
নির্ণেয় সমাধান সেট x = {a, b}

Solution

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