Question

simplify the following




please help me ​

Answer 1

x+y=4,xy=2,x^2+y^2=?

(x+y)^2= x^2+y^2+2xy

=>(4)^2= x^2+y^2+2(2)

=>16=x^2+y^2+4

=>x^2+y^2=16-4

so,x^2+y^2=12