X2-16x-11=-8x-2

Solution for X2-16x-11=-8x-2 equation:

X2-16X-11=-8X-2

We move all terms to the left:

X2-16X-11-(-8X-2)=0

We add all the numbers together, and all the variables

X^2-16X-(-8X-2)-11=0

We get rid of parentheses

X^2-16X+8X+2-11=0

We add all the numbers together, and all the variables

X^2-8X-9=0

a = 1; b = -8; c = -9;
Δ = b2-4ac
Δ = -82-4·1·(-9)
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{-(-8)-10}{2*1}=\frac{-2}{2}
=-1
$
$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-8)+10}{2*1}=\frac{18}{2}
=9
$