5-8.85x^2-1=0

Solution for 5-8.85x^2-1=0 equation:

5-8.85x^2-1=0

We add all the numbers together, and all the variables

-8.85x^2+4=0

a = -8.85; b = 0; c = +4;
Δ = b2-4ac
Δ = 02-4·(-8.85)·4
Δ = 141.6
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{-(0)-\sqrt{141.6}}{2*-8.85}=\frac{0-\sqrt{141.6}}{-17.7}
=-\frac{\sqrt{}}{-17.7}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+\sqrt{141.6}}{2*-8.85}=\frac{0+\sqrt{141.6}}{-17.7}
=\frac{\sqrt{}}{-17.7}
$