2x2+4=400

Solution for 2x2+4=400 equation:

2x^2+4=400

We move all terms to the left:

2x^2+4-(400)=0

We add all the numbers together, and all the variables

2x^2-396=0

a = 2; b = 0; c = -396;
Δ = b2-4ac
Δ = 02-4·2·(-396)
Δ = 3168
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:

$\sqrt{\Delta}=\sqrt{3168}=\sqrt{144*22}=\sqrt{144}*\sqrt{22}=12\sqrt{22}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-12\sqrt{22}}{2*2}=\frac{0-12\sqrt{22}}{4}
=-\frac{12\sqrt{22}}{4}
=-3\sqrt{22}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+12\sqrt{22}}{2*2}=\frac{0+12\sqrt{22}}{4}
=\frac{12\sqrt{22}}{4}
=3\sqrt{22}
$