Question

if a+b=8 and ab=12 then what is the difference between a and b

Answer 1

(a-b)^2= (a+b)^2 - 4ab

(a-b)^2= (8)^2 - 4×12

(a-b)^2= 64 - 48

(a-b)^2=16

a-b= √16

a-b =4