ആണെങ്കിൽ, ന്റെ മൂല്യം എന്തായിരിക്കും?

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SSC CGL 2023 Tier-I Official Paper (Held On: 18 Jul 2023 Shift 2)
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  1. -8898
  2. -8896
  3. -8886
  4. -8892

Answer (Detailed Solution Below)

Option 3 : -8886
vigyan-express
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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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നൽകിയിരിക്കുന്നത്:

x - (1/x) = (- 6)

ഉപയോഗിച്ച സൂത്രവാക്യം:

x - (1/x) = P ആണെങ്കിൽ,

x + (1/x) = √(P2 + 4) 

x + (1/x) = P ആണെങ്കിൽ,

x 3 + (1/x 3 ) = (P 3 - 3P)

x 5 - (1/x 5 ) = {x 3 + (1/x 3 )} × {x 2 - 1/x 2 } + {x - (1/x)}

കണക്കുകൂട്ടല്‍:

x - (1/x) = (- 6)

x + (1/x) = √{(- 6) 2 + 4} = √40 = 2√10

അതിനാൽ , x 2 - 1/x 2 = (x + 1/x) (x - 1/x) = 2 √10 × (-6) = -12√10

കൂടാതെ x 3 + (1/x 3 ) = (√40) 3 - 3 √40

⇒ 40√40 - 3√40 = 37 × 2√10 = 74√10

ഇപ്പോൾ,

x 5 - (1/x 5 ) = {x 3 + (1/x3 )} × {x 2 - 1/x 2 } + {x - (1/x)}

⇒ {74√10 × (-12√10) } + (- 6)

⇒ - 74 × 12 × ( √10 × √10) - 6

⇒ (- 8880) - 6 = - 8886

∴ ശരിയായ ഉത്തരം - 8886 ആണ്.

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