Abdi how two electric train sets: A and B. Each train is on its own circular track. He starts both trains at the same time. Train A return to its starting point every 12 seconds. Train B returns to it starting point every 9 sections. If the trains continue traveling, what is the least amount of time, in seconds, that both trains will arrive at the starting points at the same time?

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 is b

step-by-step explanation:

y/x of point b= y/x of point a

step-by-step explanation:

(i got the same question, this was the correct answer.)