Did he make an error?
4x+6-x=2x+3
1st step: 5x+6=2x+3

yes, what you do to one side you must do to the other. In order to move the x over you must add it to both sides so the first step would be 4x+6=3x+3

4x+6-x=2x+3

1st step: 5x+6=2x+3

YES

He made an error when combine like terms

He's supposed to get 3x from 4x - x

So correct in step 1 should be

3x+6 =2x+3

x= -3 and

step-by-step explanation:

to find the roots of a cubic, use division or factoring to find the factors then set equal to 0. as this is a difference of cubes, it factors into

where a is the cube root of .

here   this is 27 and the cube root of 27 is 3. so we write using the form:

.

set each factor to 0 and solve for x.

x-3=0

x=3

the quadratic expression does not factor and must be solved using the quadratic formula.

where a = 1, b=3, and c=9

this cubic has two complex roots.