-1=-361u^2

Solution for -1=-361u^2 equation:

-1=-361u^2

We move all terms to the left:

-1-(-361u^2)=0

We get rid of parentheses

361u^2-1=0

a = 361; b = 0; c = -1;
Δ = b2-4ac
Δ = 02-4·361·(-1)
Δ = 1444
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$u_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$u_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{1444}=38$
$u_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-38}{2*361}=\frac{-38}{722}
=-1/19
$
$u_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+38}{2*361}=\frac{38}{722}
=1/19
$