Question

If a+b=5 and ab=2 find the value of a^2+b^2

Answer 1

Answer:

formula :(a+b)^2 = a^2 + b^2 +2ab

=)(5)^2=a^2 + b^2 + 2(2)

=)25=a^2 + b^2 +4

=)a^2 + b^2 = 25-4

=)a^2 + b^2=21