Answer:

Step-by-step explanation:

We will start by using the quadratic formula.

We will simplify that and get:

So our answers would be:

D(7, 3), E(8, 1), and F(4, -1)
We calculate the squared distances between the points:



Since
we have a right triangle with hypotenuse DF.
the slope of the given point is m=−3/4