28x2+28=32

Solution for 28x2+28=32 equation:

28x^2+28=32

We move all terms to the left:

28x^2+28-(32)=0

We add all the numbers together, and all the variables

28x^2-4=0

a = 28; b = 0; c = -4;
Δ = b2-4ac
Δ = 02-4·28·(-4)
Δ = 448
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:

$\sqrt{\Delta}=\sqrt{448}=\sqrt{64*7}=\sqrt{64}*\sqrt{7}=8\sqrt{7}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-8\sqrt{7}}{2*28}=\frac{0-8\sqrt{7}}{56}
=-\frac{8\sqrt{7}}{56}
=-\frac{\sqrt{7}}{7}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+8\sqrt{7}}{2*28}=\frac{0+8\sqrt{7}}{56}
=\frac{8\sqrt{7}}{56}
=\frac{\sqrt{7}}{7}
$