In the following problem, which step uses the additive identity to get to the next step.
1. -18+73+18
2. -18 +18+73
3. 0+73
4. 73
step 1, 2, 3, or 4?

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.

attachment?

step-by-step explanation: