Posted by dianne on Tuesday, October 4, 2011 at 6:14pm.
use the discriminant to determine whether the following equations have solutions that are: tow different rational solutions; two different irrational solutions; exactly one rational solution; or two different imaginary solutions. 25x^2=10x1

Pre Algebra  Steve, Tuesday, October 4, 2011 at 8:21pm
25x^2  10x + 1 = 0
discriminant = b^2  4ac = 100100 = 0
so, the roots are the same.
(5x1)(5x1)
Why does the discriminant determine how many roots? Well, the roots are basically b/2a +/ the discriminant. So, if the discriminant is zero, both roots are b/2a
If the discriminant is positive, both roots are the same distance away from b/2a
If the discriminant is negative, there is no real square root, and we have complex roots.
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