if a-b=9,a^2+b^2=881 what is a+b
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a-b= 9
=> (a-b)² = 9²
=> a² + b² -2ab = 81
=> 881 - 81 = 2ab
=> 800 = 2ab
Now, (a+b)² = a² + b² + 2ab
=> (a+b)² = 881 + 800
=> (a+b)² = 1681
=> (a+b) = √1681
=> (a+b) = 41
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