6a-3a*a=-1

Solution for 6a-3a*a=-1 equation:

6a-3a*a=-1

We move all terms to the left:

6a-3a*a-(-1)=0

We add all the numbers together, and all the variables

6a-3a*a+1=0

Wy multiply elements

-3a^2+6a+1=0

a = -3; b = 6; c = +1;
Δ = b2-4ac
Δ = 62-4·(-3)·1
Δ = 48
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:

$\sqrt{\Delta}=\sqrt{48}=\sqrt{16*3}=\sqrt{16}*\sqrt{3}=4\sqrt{3}$
$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(6)-4\sqrt{3}}{2*-3}=\frac{-6-4\sqrt{3}}{-6}
$
$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(6)+4\sqrt{3}}{2*-3}=\frac{-6+4\sqrt{3}}{-6}
$