4(x-3)(x+2)=0

Solution for 4(x-3)(x+2)=0 equation:

4(x-3)(x+2)=0

We multiply parentheses ..

4(+x^2+2x-3x-6)=0

We multiply parentheses

4x^2+8x-12x-24=0

We add all the numbers together, and all the variables

4x^2-4x-24=0

a = 4; b = -4; c = -24;
Δ = b2-4ac
Δ = -42-4·4·(-24)
Δ = 400
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{400}=20$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-4)-20}{2*4}=\frac{-16}{8}
=-2
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-4)+20}{2*4}=\frac{24}{8}
=3
$