X^2-17x-16=1

Solution for X^2-17x-16=1 equation:

X^2-17X-16=1

We move all terms to the left:

X^2-17X-16-(1)=0

We add all the numbers together, and all the variables

X^2-17X-17=0

a = 1; b = -17; c = -17;
Δ = b2-4ac
Δ = -172-4·1·(-17)
Δ = 357
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-17)-\sqrt{357}}{2*1}=\frac{17-\sqrt{357}}{2}
$
$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-17)+\sqrt{357}}{2*1}=\frac{17+\sqrt{357}}{2}
$