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If (a + b) = 11 and (ab) = 10, find the value of (a - b).
1. 1
2. 4
3. 9
4. 16

1 Answer

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Correct Answer - Option 3 : 9

Given:

(a + b) = 11

ab = 10

Formula Used:

(a + b)2 = a2 + b2 + 2ab

(a - b)2 = a2 + b2 - 2ab

Calculation:

Squaring both the side

(a + b)2 = (11)2

⇒ a2 + b2 + (2 × 10) = 121

⇒ a2 + b2 = 101

(a - b)2 = a2 + b2 - 2ab

⇒ (a - b)2 = 101 - 2(10)

⇒ (a - b)2 = 81

∴ a - b = 9

The correct option is 3 i.e. 9        

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