(-0.5x+2)(x+2)=4

Solution for (-0.5x+2)(x+2)=4 equation:

(-0.5x+2)(x+2)=4

We move all terms to the left:

(-0.5x+2)(x+2)-(4)=0

We multiply parentheses ..

(+0x^2+0x+2x+4)-4=0

We get rid of parentheses

0x^2+0x+2x+4-4=0

We add all the numbers together, and all the variables

x^2+3x=0

a = 1; b = 3; c = 0;
Δ = b2-4ac
Δ = 32-4·1·0
Δ = 9
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{9}=3$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(3)-3}{2*1}=\frac{-6}{2}
=-3
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(3)+3}{2*1}=\frac{0}{2}
=0
$