Aaron and rachel can clear the weeds out of their vegetable garden 2 hours if they work together. if aaron works alone, it will take him 5 hours. the year before that, kara painted it by herself and it took 12 hours longer. how long did it take kara to paint the fence?
a. 12 hours
b. 24 hours
c. 20 hours
d. 8 hours

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.