5x(x-1)-10=0

Solution for 5x(x-1)-10=0 equation:

5x(x-1)-10=0

We multiply parentheses

5x^2-5x-10=0

a = 5; b = -5; c = -10;
Δ = b2-4ac
Δ = -52-4·5·(-10)
Δ = 225
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{225}=15$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-5)-15}{2*5}=\frac{-10}{10}
=-1
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-5)+15}{2*5}=\frac{20}{10}
=2
$