Answer:
there are 3 roots at x=+-1, +3, +4
Step-by-step explanation:
I already answered that question, here's the link:
brainly.com/question/10534199.
But if you still want the explanation, here it is:
"So if we want to measure probability, you have to add, then divide, like this:
First

, which gives us 18.
Then we see, that 6 is 1/3 of 18, so we conclude.
The answer is 33.33%.
Hope this helped!"
You substitute the y from the second eqaution to the y in the first equation