7x*x=12.6

Solution for 7x*x=12.6 equation:

7x*x=12.6

We move all terms to the left:

7x*x-(12.6)=0

We add all the numbers together, and all the variables

7x*x-12.6=0

Wy multiply elements

7x^2-12.6=0

a = 7; b = 0; c = -12.6;
Δ = b2-4ac
Δ = 02-4·7·(-12.6)
Δ = 352.8
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{352.8}}{2*7}=\frac{0-\sqrt{352.8}}{14}
=-\frac{\sqrt{}}{14}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+\sqrt{352.8}}{2*7}=\frac{0+\sqrt{352.8}}{14}
=\frac{\sqrt{}}{14}
$