8.1x^2-210x=0

Solution for 8.1x^2-210x=0 equation:

8.1x^2-210x=0

a = 8.1; b = -210; c = 0;
Δ = b2-4ac
Δ = -2102-4·8.1·0
Δ = 44100
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{44100}=210$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-210)-210}{2*8.1}=\frac{0}{16.2}
=0
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-210)+210}{2*8.1}=\frac{420}{16.2}
=25+15/16.2
$