How to use the discriminant to find out what type of solutions the equation has for $4x^2 - 20x + 25$ ?

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Answer 1 · 2015-05-18T17:38:49

$D = d^2 = 400 - 200. = 200 = 100(2) -> d = +- 10sqrt2$

There are 2 real roots.

$x = 20/8 + (10sqrt2)/8 = 10/4 + (5sqrt2)/4$

$x = 10/4 - (5sqrt2)/4$

How to use the discriminant to find out what type of solutions the equation has for 4x^2 - 20x + 254x^2 - 20x + 25?