If a + b = 4 and ab = -12, then a

If a + b = 4 and ab = -12, then a - b equals to-

A ±8

B ±24

C ±2

D ±6

Solution

Correct Answer: Option A

দেয়া আছে,
a + b = 4
ab = -12

(a - b)² = (a + b)² - 4ab
⇒ (a - b)² = (4)² - 4(-12)
⇒ (a - b)² = 16 + 48
⇒ (a - b)² = 64
⇒ a - b = ±√64
⇒ a - b = ±8

অতএব, a - b = ±8

Solution

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