25y^2-7921=0

Solution for 25y^2-7921=0 equation:

25y^2-7921=0

a = 25; b = 0; c = -7921;
Δ = b2-4ac
Δ = 02-4·25·(-7921)
Δ = 792100
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{792100}=890$
$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-890}{2*25}=\frac{-890}{50}
=-17+4/5
$
$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+890}{2*25}=\frac{890}{50}
=17+4/5
$