The area is (2x + 15) square centimeters.
the ratio of the shaded region to the unshaded region is 3 : 2.
write an algebraic expression for the area of the shaded region in terms of x.

Step-by-step explanation:

Let be the shaded area and be the unshaded area, then we know that

(1).  

and

(2).  

We solve for in the first equation and get:

and put this into the second equation and get:

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.

b.-4 units

all you   do is count how many times you move