0=(x+6)(x-4)

Solution for 0=(x+6)(x-4) equation:

0=(x+6)(x-4)

We move all terms to the left:

0-((x+6)(x-4))=0

We add all the numbers together, and all the variables

-((x+6)(x-4))=0

We multiply parentheses ..

-((+x^2-4x+6x-24))=0


We calculate terms in parentheses: -((+x^2-4x+6x-24)), so:

(+x^2-4x+6x-24)

We get rid of parentheses

x^2-4x+6x-24

We add all the numbers together, and all the variables

x^2+2x-24

Back to the equation:

-(x^2+2x-24)


We get rid of parentheses

-x^2-2x+24=0

We add all the numbers together, and all the variables

-1x^2-2x+24=0

a = -1; b = -2; c = +24;
Δ = b2-4ac
Δ = -22-4·(-1)·24
Δ = 100
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{100}=10$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-2)-10}{2*-1}=\frac{-8}{-2}
=+4
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-2)+10}{2*-1}=\frac{12}{-2}
=-6
$