Question

find the value of a-b when a+b = 9 and ab=20

Answer 1

Answer:

x - y = 1

Step-by-step explanation:

as

$(x + y) ^{2} - (x - y)^{2} = \: 4xy$

=>

${9}^{2} - (x - y)^{2} = 80$

$=> (x - y)^{2} = 1$

x - y = 1