Math
posted by Untamed .
Determine for what value(s) of d the quadratic equation 5x^210x+d = 0 has
i) real and distinct roots
ii)real and equal roots
iii)nonreal roots
This is what I did to solve for A.
5x^210x+d = 0
b^24ac = 0
(10)^24(5)(d) = 0
10020d = 0
20d = 100
d = 5
Need help with others.

Close. Actually, you solved for (ii).
i) D > 0
100  20d > 0
d < 5
ii) D=0
10020d = 0
d = 5
iii) D < 0
10020d < 0
d > 5