x(4.15)x=1.4

Solution for x(4.15)x=1.4 equation:

x(4.15)x=1.4

We move all terms to the left:

x(4.15)x-(1.4)=0

We add all the numbers together, and all the variables

x(4.15)x-1.4=0

We multiply parentheses

4.15x^2-1.4=0

a = 4.15; b = 0; c = -1.4;
Δ = b2-4ac
Δ = 02-4·4.15·(-1.4)
Δ = 23.24
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{23.24}}{2*4.15}=\frac{0-\sqrt{23.24}}{8.3}
=-\frac{\sqrt{}}{8.3}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+\sqrt{23.24}}{2*4.15}=\frac{0+\sqrt{23.24}}{8.3}
=\frac{\sqrt{}}{8.3}
$