You can use where clause and guards together.
The discriminant tells you about the "nature" of the roots of a quadratic equation given that a, b and c are rational numbers, number of roots for the quadratic equation.
Discriminant = b^2 - 4*a*c
if Discriminant > 0 then number of roots are 2.
if Discriminant = 0 then number of roots are 1, else 0.
discriminant.hs
roots a b c
| (descriminant > 0) = 2
| (descriminant == 0) = 1
| otherwise = 0
where
descriminant = b^2 - 4*a*c
*Main> :load discriminant.hs
[1 of 1] Compiling Main ( discriminant.hs, interpreted )
Ok, modules loaded: Main.
*Main> roots 1 6 8
2
*Main> roots 1 6 9
1
*Main> roots 1 6 10
0
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