1.

a - b = 9, ab = 10 find the value of a + b1. 112. 123. 164. 22

Answer» Correct Answer - Option 1 : 11

Given:

a - b = 9

ab = 10

Formula Used:

(a – b)2 = (a + b)2 – 4ab

Calculation:

substituting the values in the formula 

92 = (a + b)– 4 × 10

⇒ 81 + 40 = (a + b)2

⇒ (a + b)= 121

Taking root on both sides 

a + b = 11

∴ The value of a + b is 11



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