Question

if a + b is equal to 9 a b is equal to 5 then find a minus b​

Answer 1

(a + b )^2 = 9^2

a^2 + b^2 + 2ab = 81

a^2 + b^2 = 81-2×5

a^2 + b^2 =71

Now ,

(a-b)^2 = a^2 + b^2 -2ab = 71-10= 61

→(a -b)=√61