Question

If A*B=90 and A+B=18then find the value of A and B

Answer 1

Answer:

B = 18 - A

AB = 90

A(18 - A) = 90

18A - A^2 = 90

A^2 - 18A + 90 = 0

Discriminant = (-18)^2 - 4×90 = 324 - 360 = - 36

therefore, there is no real root