SOLUTION: if the discriminant of (5u^2)+by+2=0 is 41, what are all the values of b

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: if the discriminant of (5u^2)+by+2=0 is 41, what are all the values of b      Log On


   

Question 426931: if the discriminant of (5u^2)+by+2=0 is 41, what are all the values of b
Answer by dnanos(83) About Me  (Show Source):
You can put this solution on YOUR website!
I think it must be written 5y%5E2%2Bby%2B2=0
I shall write the answer for that.
Discriminant of ax%5E2%2Bbx%2Bc=0
isb%5E2-4ac=41,with a=5,and c=2
that is
b%5E2-4%2A5%2A2=41
b%5E2-40=41
b%5E2=41%2B40
b%5E2=81
b=%2Bsqrt%2881%29 or b=-sqrt%2881%29
that is
b=9 or b=-9