1.29x2=2.58

Solution for 1.29x2=2.58 equation:

1.29x^2=2.58

We move all terms to the left:

1.29x^2-(2.58)=0

We add all the numbers together, and all the variables

1.29x^2-2.58=0

a = 1.29; b = 0; c = -2.58;
Δ = b2-4ac
Δ = 02-4·1.29·(-2.58)
Δ = 13.3128
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{13.3128}}{2*1.29}=\frac{0-\sqrt{13.3128}}{2.58}
=-\frac{\sqrt{}}{2.58}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+\sqrt{13.3128}}{2*1.29}=\frac{0+\sqrt{13.3128}}{2.58}
=\frac{\sqrt{}}{2.58}
$