4a^2-6=39

Solution for 4a^2-6=39 equation:

4a^2-6=39

We move all terms to the left:

4a^2-6-(39)=0

We add all the numbers together, and all the variables

4a^2-45=0

a = 4; b = 0; c = -45;
Δ = b2-4ac
Δ = 02-4·4·(-45)
Δ = 720
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{720}=\sqrt{144*5}=\sqrt{144}*\sqrt{5}=12\sqrt{5}$
$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-12\sqrt{5}}{2*4}=\frac{0-12\sqrt{5}}{8}
=-\frac{12\sqrt{5}}{8}
=-\frac{3\sqrt{5}}{2}
$
$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+12\sqrt{5}}{2*4}=\frac{0+12\sqrt{5}}{8}
=\frac{12\sqrt{5}}{8}
=\frac{3\sqrt{5}}{2}
$