Answer:
because when you do 15*0 it =0 so anything else multiplied by 0 is 0
Step-by-step explanation:
Step-by-step explanation:

Answer:
other x values are -5,-4
Step-by-step explanation:
f(x)=0 for x=−6
Apply synthetic division to get the quotient . using that we find other two values of x
-6 1 15 74 120
0 -6 - 54 -120
-------------------------------------------------
1 9 20 0
the quotient is 
now factor the left hand side, product is 20 and sum is 9

So other x values are -5,-4
The legth is 3.6 :) it says it to the right
11 < square root of 85 because that is 9.219...
~JZ