Question

a^2+b^2=131,ab=5 find (a-b)

Answer 1

(a - b)²= a² + b² - 2ab
Now putting the values, We get

(a - b)² = 131 - 2×5= 131 - 10 =121

Answer 2

a²+b² = 131
ab = 5
a-b = ?
(a-b)² = a²+b²-2ab
        = 131-10
(a-b)² = 121
(a-b) = 11