10x^2+9=869

Solution for 10x^2+9=869 equation:

10x^2+9=869

We move all terms to the left:

10x^2+9-(869)=0

We add all the numbers together, and all the variables

10x^2-860=0

a = 10; b = 0; c = -860;
Δ = b2-4ac
Δ = 02-4·10·(-860)
Δ = 34400
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:

$\sqrt{\Delta}=\sqrt{34400}=\sqrt{400*86}=\sqrt{400}*\sqrt{86}=20\sqrt{86}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-20\sqrt{86}}{2*10}=\frac{0-20\sqrt{86}}{20}
=-\frac{20\sqrt{86}}{20}
=-\sqrt{86}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+20\sqrt{86}}{2*10}=\frac{0+20\sqrt{86}}{20}
=\frac{20\sqrt{86}}{20}
=\sqrt{86}
$