7*x^2-12.6x=0

Solution for 7*x^2-12.6x=0 equation:

7x^2-12.6x=0

a = 7; b = -12.6; c = 0;
Δ = b2-4ac
Δ = -12.62-4·7·0
Δ = 158.76
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-12.6)-\sqrt{158.76}}{2*7}=\frac{12.6-\sqrt{158.76}}{14}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-12.6)+\sqrt{158.76}}{2*7}=\frac{12.6+\sqrt{158.76}}{14}
$