a2 - 4a + 3 = 0 হলে a = ?
Solution
Correct Answer: Option D
a2 - 4a + 3 = 0
⇒ a2 - 3a - a + 3 = 0
⇒ a(a - 3) - 1(a + 3) = 0
⇒(a - 3)(a - 1) = 0
হয়, a - 3 = 0
⇒ a = 3
অথবা, a - 1 = 0
⇒ a = 1
⇒ a2 - 3a - a + 3 = 0
⇒ a(a - 3) - 1(a + 3) = 0
⇒(a - 3)(a - 1) = 0
হয়, a - 3 = 0
⇒ a = 3
অথবা, a - 1 = 0
⇒ a = 1
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