If a + b = 11 and a - b = 5, then calculate the value of a- b2?

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NPCIL Stipendiary Trainee 2021 Official Paper-I
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  1. 256
  2. 146
  3. 96
  4. 55

Answer (Detailed Solution Below)

Option 4 : 55
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Detailed Solution

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Given:

If a + b = 11 and a - b = 5

Formula used:

a2 - b2 = (a + b) × (a - b)

Calculation:

a + b = 11

a - b = 5

⇒ a2 - b2 = (11) × (5)

⇒ a2 - b2 = 55

∴ The correct answer is option (4).

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