10x2+8=158

Solution for 10x2+8=158 equation:

10x^2+8=158

We move all terms to the left:

10x^2+8-(158)=0

We add all the numbers together, and all the variables

10x^2-150=0

a = 10; b = 0; c = -150;
Δ = b2-4ac
Δ = 02-4·10·(-150)
Δ = 6000
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:

$\sqrt{\Delta}=\sqrt{6000}=\sqrt{400*15}=\sqrt{400}*\sqrt{15}=20\sqrt{15}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-20\sqrt{15}}{2*10}=\frac{0-20\sqrt{15}}{20}
=-\frac{20\sqrt{15}}{20}
=-\sqrt{15}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+20\sqrt{15}}{2*10}=\frac{0+20\sqrt{15}}{20}
=\frac{20\sqrt{15}}{20}
=\sqrt{15}
$