a2=6.4

Solution for a2=6.4 equation:

a2=6.4

We move all terms to the left:

a2-(6.4)=0

We add all the numbers together, and all the variables

a^2-6.4=0

a = 1; b = 0; c = -6.4;
Δ = b2-4ac
Δ = 02-4·1·(-6.4)
Δ = 25.6
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-\sqrt{25.6}}{2*1}=\frac{0-\sqrt{25.6}}{2}
=-\frac{\sqrt{}}{2}
$
$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+\sqrt{25.6}}{2*1}=\frac{0+\sqrt{25.6}}{2}
=\frac{\sqrt{}}{2}
$