8y*5y=2,5

Solution for 8y*5y=2,5 equation:

8y*5y=2.5

We move all terms to the left:

8y*5y-(2.5)=0

We add all the numbers together, and all the variables

8y*5y-2.5=0

Wy multiply elements

40y^2-2.5=0

a = 40; b = 0; c = -2.5;
Δ = b2-4ac
Δ = 02-4·40·(-2.5)
Δ = 400
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{400}=20$
$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-20}{2*40}=\frac{-20}{80}
=-1/4
$
$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+20}{2*40}=\frac{20}{80}
=1/4
$