(3a)(a^-3)=3a

Solution for (3a)(a^-3)=3a equation:

(3a)(a^-3)=3a

We move all terms to the left:

(3a)(a^-3)-(3a)=0

We add all the numbers together, and all the variables

-3a+3a(a^-3)=0

We multiply parentheses

3a^2-3a-9a=0

We add all the numbers together, and all the variables

3a^2-12a=0

a = 3; b = -12; c = 0;
Δ = b2-4ac
Δ = -122-4·3·0
Δ = 144
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{144}=12$
$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-12)-12}{2*3}=\frac{0}{6}
=0
$
$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-12)+12}{2*3}=\frac{24}{6}
=4
$