28u^2-63=0

Solution for 28u^2-63=0 equation:

28u^2-63=0

a = 28; b = 0; c = -63;
Δ = b2-4ac
Δ = 02-4·28·(-63)
Δ = 7056
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$u_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$u_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{7056}=84$
$u_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-84}{2*28}=\frac{-84}{56}
=-1+1/2
$
$u_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+84}{2*28}=\frac{84}{56}
=1+1/2
$