Question

If (a+b)2 =10 and ab=1 then find a2 +b2
A number x is added to it's reciprocal gives _

Answer 1

c=x=10

Explanation:

2(a+b)=10

a+b= 5

a=5−b

ab=1

(5−b)b=1

c=2a+2b

c=2(5−b)+2b

c=10