(x+7-9)(x+7+9)=0

Solution for (x+7-9)(x+7+9)=0 equation:

(x+7-9)(x+7+9)=0

We add all the numbers together, and all the variables

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

We multiply parentheses ..

(+x^2+16x-2x-32)=0

We get rid of parentheses

x^2+16x-2x-32=0

We add all the numbers together, and all the variables

x^2+14x-32=0

a = 1; b = 14; c = -32;
Δ = b2-4ac
Δ = 142-4·1·(-32)
Δ = 324
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{324}=18$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(14)-18}{2*1}=\frac{-32}{2}
=-16
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(14)+18}{2*1}=\frac{4}{2}
=2
$