5x^2=0^2+2(9.81-0)

Solution for 5x^2=0^2+2(9.81-0) equation:

5x^2=0^2+2(9.81-0)

We move all terms to the left:

5x^2-(0^2+2(9.81-0))=0

We add all the numbers together, and all the variables

5x^2-(0^2+2(9.81))=0

We add all the numbers together, and all the variables

5x^2-19.62=0

a = 5; b = 0; c = -19.62;
Δ = b2-4ac
Δ = 02-4·5·(-19.62)
Δ = 392.4
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{392.4}}{2*5}=\frac{0-\sqrt{392.4}}{10}
=-\frac{\sqrt{}}{10}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+\sqrt{392.4}}{2*5}=\frac{0+\sqrt{392.4}}{10}
=\frac{\sqrt{}}{10}
$