Answer:
-15
Step-by-step explanation:
Cancel out each product, equalling as so.
The vertex is exactly in the middle of the two intersections with the x axis.
So, it's in the middle of x=3 and x=9.
What's the middle of 3 and 9? You can find this by calculating the average.
(3+9)/2 = 6
So, the vertex is at x = 6.
<h3>Answer:</h3>
<h3>Explanation:</h3>
You know that the sum of a number and a fraction is ...
... a + b/c = (ac +b)/c
Here, you have ...
... a = 6
... b = -(x+5)
... c = (7x-5)(x+4) = 7x² +23x -20
Then ...
... (ac +b)/c = (6(7x² +23x -20) -(x +5))/(7x² +23x -20)
... = (42x² +138x -120 -x -5)/(7x² +23x -20)
... = (42x² +137x -125)/(7x² +23x -20)
55 because 55 divided by 18 is 32%. Hope this helped!