Answer:
x=9
Step-by-step explanation:
These two angles are equal since they are alternate exterior angles
-1 +14x = 12x+17
Subtract 12x from each side
-1 +14x-12x = 12x-12x+17
-1+2x= 17
Add 1 to each side
-1+1+2x = 17+1
2x = 18
2x/2 = 18/2
x =9

The multiple zero is x = -4.
The multiplicity is 2 because there are two values of x.
the factor for this expression is 7
Factor completely x³ + 6x² - 3x – 18

with a root of x = -6
the answer is 210