4x(2)=1.6(5)

Solution for 4x(2)=1.6(5) equation:

4x(2)=1.6(5)

We move all terms to the left:

4x(2)-(1.6(5))=0

We add all the numbers together, and all the variables

4x^2-1.65=0

a = 4; b = 0; c = -1.65;
Δ = b2-4ac
Δ = 02-4·4·(-1.65)
Δ = 26.4
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{26.4}}{2*4}=\frac{0-\sqrt{26.4}}{8}
=-\frac{\sqrt{}}{8}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+\sqrt{26.4}}{2*4}=\frac{0+\sqrt{26.4}}{8}
=\frac{\sqrt{}}{8}
$