x(100-3x)=0

Solution for x(100-3x)=0 equation:

x(100-3x)=0

We add all the numbers together, and all the variables

x(-3x+100)=0

We multiply parentheses

-3x^2+100x=0

a = -3; b = 100; c = 0;
Δ = b2-4ac
Δ = 1002-4·(-3)·0
Δ = 10000
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{10000}=100$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(100)-100}{2*-3}=\frac{-200}{-6}
=33+1/3
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(100)+100}{2*-3}=\frac{0}{-6}
=0
$