If x - y = 2 and xy = 3, then x + y =?
Solution
Correct Answer: Option D
(x – y)² = (x + y)² - 4xy
⇒ 2² = (x + y)² - 4 × 3
⇒ (x + y)² = 12 + 4
⇒ x + y = √16
⇒ x + y = ± 4
⇒ 2² = (x + y)² - 4 × 3
⇒ (x + y)² = 12 + 4
⇒ x + y = √16
⇒ x + y = ± 4
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