(x-4)(x+6)=39

Solution for (x-4)(x+6)=39 equation:

(x-4)(x+6)=39

We move all terms to the left:

(x-4)(x+6)-(39)=0

We multiply parentheses ..

(+x^2+6x-4x-24)-39=0

We get rid of parentheses

x^2+6x-4x-24-39=0

We add all the numbers together, and all the variables

x^2+2x-63=0

a = 1; b = 2; c = -63;
Δ = b2-4ac
Δ = 22-4·1·(-63)
Δ = 256
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{256}=16$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(2)-16}{2*1}=\frac{-18}{2}
=-9
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(2)+16}{2*1}=\frac{14}{2}
=7
$