It is a difference of squares, so we can factor this to

Then, we can solve for
.

Hope this helps.
頑張って!
Look on the internet please
Answer:
You are correct. The answer is 
Step-by-step explanation:
First, we need to plug in our x value to the derviative's equation to find the slope of the line tangent to the graph, f

Now that we have found the slope and have a given point: (-1,6) we can use the point slope formula to find the equation of the line tangent to the graph f.

It would be 24:18 or if you simplified it (dividing by 6), you’d get a 4:3 ratio.