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If √x = √3 - √5, then the value of x2 - 16x + 6 is:1. 42. 03. 24. -2 |
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Answer» Correct Answer - Option 3 : 2 Given: √x = √3 – √ 5 Calculation: Squaring both sides (√x)2 = (√3 – √5)2 ⇒ x = 3 + 5 – 2√15 ⇒ x – 8 = -2√15 Again, squaring both sides (x – 8)2 = (-2√15)2 ⇒ x2 + 64 – 16x = 4 × 15 ⇒ x2 + 4 – 16x = 0 ⇒ x2 – 16x + 6 = 2 ∴ The value is 2. |
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