What is the value of the rational expression below when x is equal to 3?
15-x over 9-x (15-x/9-x)

a) 3 over 2 (3/2)
b) 5 over 3 (5/3)
c) -2
d) 2

4x and 6y

im not sure though

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.