(a3 + b3) అనేది (a2 – b2) కి అనులోమానుపాతంలో ఉంటే, (a2 - ab + b2) అనేది క్రింది వాటిలో దేనికి అనులోమానుపాతంలో ఉంటుంది?

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CDS 02/2022 Elementary Mathematics Official Paper (Held On 04 Sep 2022)
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  1. (a - b)
  2. (a + b)
  3. (a + ab + b)
  4. (a3 – b3)

Answer (Detailed Solution Below)

Option 1 : (a - b)
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Detailed Solution

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ఉపయోగించిన సూత్రం:

a3 b= (a + b)(a- ab + b2)

a2 - b= (a + b)(a - b)

గణన:

ప్రశ్న ప్రకారం

(a3 + b3) ∝ (a2 – b2)

పై సర్వసమీకరణాన్ని ఉపయోగించగా 

⇒ (a + b)(a - ab + b2) ∝ (a + b)(a - b)

⇒ (a - ab + b2) ∝ (a - b)

∴ (a - ab + b2) అనేది  a - b కి అనులోమానుపాతంలో ఉంటుంది.   

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