(x-4)2=x2-16

Solution for (x-4)2=x2-16 equation:

(x-4)2=x2-16

We move all terms to the left:

(x-4)2-(x2-16)=0

We add all the numbers together, and all the variables

-(+x^2-16)+(x-4)2=0

We multiply parentheses

-(+x^2-16)+2x-8=0

We get rid of parentheses

-x^2+2x+16-8=0

We add all the numbers together, and all the variables

-1x^2+2x+8=0

a = -1; b = 2; c = +8;
Δ = b2-4ac
Δ = 22-4·(-1)·8
Δ = 36
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{36}=6$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(2)-6}{2*-1}=\frac{-8}{-2}
=+4
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(2)+6}{2*-1}=\frac{4}{-2}
=-2
$