Question

if a*a + b*b =2 and a+b=5, thenn determine the value of ab?

Answer 1

(a+b)^2=a^2+b^2+2ab
5^2=2+2ab
25=2+2ab
2ab=23
ab=23/2=11.5

Answer 2

please see the attachment.
The value of ab is 11.5