2x(7-2x)=0

Solution for 2x(7-2x)=0 equation:

2x(7-2x)=0

We add all the numbers together, and all the variables

2x(-2x+7)=0

We multiply parentheses

-4x^2+14x=0

a = -4; b = 14; c = 0;
Δ = b2-4ac
Δ = 142-4·(-4)·0
Δ = 196
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{196}=14$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(14)-14}{2*-4}=\frac{-28}{-8}
=3+1/2
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(14)+14}{2*-4}=\frac{0}{-8}
=0
$