Question

a2+b2=41,ab=20 then find (a+b)

Answer 1

$a^2+b^2= 41 ,ab=20 a+b= ...$

(a+b)^2=a^2+b^2+2ab.

so ,(a+b)^2= 41+2×20
(a+b)^2=81
a+b=√81
a+b=9

$(a+b=9)$.