4a^2-2ab-5b^2 :) that is simplified
If it bisect, then using the Line Bisector Theorem, it must be equal.
So x+6=4x-21
get like terms on 1 side
x+6=4x-21
-x. +21
27= 3x
x=9
plug the x in
CD= 9+6
CD=15
For this case we must find the product of the following expression:

So, we have:

By law of signs of multiplication is fulfilled:

ANswer:

I don’t really know I’m guessing Sorry A 4