If a-b=3 and a2+b2= Find the value of ab?

A    10

B    12

C    15

D    18

Solution

Correct Answer: Option A

 

a2+b2=29

=> (a-b)2+2ab=29

=> (3)2+2ab=29

=> 2ab=20

=> ab=10 (Ans.)

 

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