Question

Find the solution
a2-b2=9
a.b=3
a+b=?

Answer 1

Explanation:

(a²+b²)²=(a²-b²)²+4a²b²=(a²-b²)²+4(ab)²=9²+4×3²=9²(1+4)

a²+b²=3√5

(a+b)²=a²+b²=2ab=3√5+2(3)=3(2+√5)

a+b=√3√(2+√5)

Answer 2

a

2

​

=9a+b

2

​

Explanation: