Tt

We know that:

This means that:

Step-by step calculations:

Open the parenthesis:

Combine like terms:

Simplify the LHS:

Add 3 both sides:

Divide 3 both sides:

Same side exterior angles are linear pair and have sum 180°

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.

answer: 72: 111

step-by-step explanation: