SOLUTION: use quadratic formula 4/5y^2+1/5y=18/5

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Question 443650: use quadratic formula
4/5y^2+1/5y=18/5
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
%284%2F5%29y%5E2%2B%281%2F5%29y=18%2F5
%284%2F5%29y%5E2%2B%281%2F5%29y-18%2F5=0
multiply by 5
we get 4y^2+y-18=0
a= 4 b= 1 c= -18

b^2-4ac=1+288
b^2-4ac=289
sqrt(289)= 17
x=%28-b%2B-sqrt%28b%5E2-4ac%29%29%2F%282a%29
x1=%28-b%2Bsqrt%28b%5E2-4ac%29%29%2F%282a%29
x1=(-1+17)/8
x1=2
x2=(-1-17)/8
x2= -2.25