Follow the steps to simplify this expression. 2x(2 + 1) – 3(x + 3)
1. Distribute 2x and –3 through the parentheses: 2x(2) + 2x(1) −3(x) − 3(3)

2. Find each product:4x + 2x − 3x − 9

3. Combine like terms.

What is the simplified expression?
A. -6x
B. 3x - 9
C. 4x - x - 9
D. 6x - 3x - 9

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.