0^2=u^2+2(-6.8)(0.8)

Solution for 0^2=u^2+2(-6.8)(0.8) equation:

0^2=u^2+2(-6.8)(0.8)

We move all terms to the left:

0^2-(u^2+2(-6.8)(0.8))=0

We add all the numbers together, and all the variables

-(u^2+2(-6.8)(0.8))=0

We multiply parentheses ..

-(u^2+2(-5.44))=0


We calculate terms in parentheses: -(u^2+2(-5.44)), so:

u^2+2(-5.44)

We add all the numbers together, and all the variables

u^2-10.88

Back to the equation:

-(u^2-10.88)


We get rid of parentheses

-u^2+10.88=0

We add all the numbers together, and all the variables

-1u^2+10.88=0

a = -1; b = 0; c = +10.88;
Δ = b2-4ac
Δ = 02-4·(-1)·10.88
Δ = 43.52
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$u_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$u_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$u_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-\sqrt{43.52}}{2*-1}=\frac{0-\sqrt{43.52}}{-2}
=-\frac{\sqrt{}}{-2}
$
$u_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+\sqrt{43.52}}{2*-1}=\frac{0+\sqrt{43.52}}{-2}
=\frac{\sqrt{}}{-2}
$