10x^2-80=360

Solution for 10x^2-80=360 equation:

10x^2-80=360

We move all terms to the left:

10x^2-80-(360)=0

We add all the numbers together, and all the variables

10x^2-440=0

a = 10; b = 0; c = -440;
Δ = b2-4ac
Δ = 02-4·10·(-440)
Δ = 17600
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{17600}=\sqrt{1600*11}=\sqrt{1600}*\sqrt{11}=40\sqrt{11}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-40\sqrt{11}}{2*10}=\frac{0-40\sqrt{11}}{20}
=-\frac{40\sqrt{11}}{20}
=-2\sqrt{11}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+40\sqrt{11}}{2*10}=\frac{0+40\sqrt{11}}{20}
=\frac{40\sqrt{11}}{20}
=2\sqrt{11}
$