Question

a+b=15. ab=30. a²-ab +b²= ?​

Answer 1

Answer:

a+b=15

ab=30

a^2-ab+b^2

=a^2+b^2-ab

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

=(a+b)^2-3ab

=(15)^2-3.30

=225-90

=135