2x^2=87-4x

Solution for 2x^2=87-4x equation:

2x^2=87-4x

We move all terms to the left:

2x^2-(87-4x)=0

We add all the numbers together, and all the variables

2x^2-(-4x+87)=0

We get rid of parentheses

2x^2+4x-87=0

a = 2; b = 4; c = -87;
Δ = b2-4ac
Δ = 42-4·2·(-87)
Δ = 712
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:

$\sqrt{\Delta}=\sqrt{712}=\sqrt{4*178}=\sqrt{4}*\sqrt{178}=2\sqrt{178}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(4)-2\sqrt{178}}{2*2}=\frac{-4-2\sqrt{178}}{4}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(4)+2\sqrt{178}}{2*2}=\frac{-4+2\sqrt{178}}{4}
$