जर , आणि 0  याचे मूल्य शोधा.

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SSC CGL 2023 Tier-I Official Paper (Held On: 17 Jul 2023 Shift 1)
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  1. 3√5
  2. 4√3
  3. -4√3
  4. -3√5

Answer (Detailed Solution Below)

Option 4 : -3√5
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PYST 1: SSC CGL - General Awareness (Held On : 20 April 2022 Shift 2)
25 Qs. 50 Marks 10 Mins

Detailed Solution

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दिलेल्याप्रमाणे:

x2 + (1/x2) = 7

वापरलेले सूत्र:

x2 + (1/x2) = P

तर x + (1/x) = √(P + 2)

आणि x - (1/x) = √(P - 2)

⇒ x2 - (1/x2) = {x + (1/x)} × {x - (1/x)}

गणना:

x2 + (1/x2) = 7

⇒ x + (1/x) = √(7 + 2) = √9

⇒ x + (1/x) = 3

⇒ x - (1/x) = √(7 - 2)

⇒ x - (1/x) = - √5 {0

x2 - (1/x2) = {x + (1/x)} × {x - (1/x)}

⇒ 3 × (- √5)

∴ योग्य उत्तर - 3√5 आहे.​
 Mistake Point

कृपया याची नोंद घ्यावी

0

म्हणून,

1/x > 1

म्हणून,

x + 1/x > 1

आणि

x - 1/x 1 म्हणून, x - 1/x

म्हणून,

(x - 1/x)(x + 1/x)

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