Answer:
Nico is incorrect because he added 3x instead of subtracting 3x from both sides.

Step-by-step explanation:
Ok, so first we need to get the equation set to 0 so we have a quadratic equation.

Here you would begin to factor but this is not possible with this equation. There is not a solution set that would be a product of 6 and a sum of 1. So you have to use the quadratic formula.

So if we look at our quadratic,


we know,

Now it's time to plug and play.

Ok, so it is impossible to have a negative root which means we have a complex number or imaginary number. We use
to represent these imaginary numbers. We can't simplify the root anymore.
