Little confused on two concepts. a) how a specific problem gets simplified and b)how to actually solve.
here is the problem:
$$Secant Slope = \Delta y/ \Delta x = ((-4-8)-2+h^2)-(-4-8(-2)^2))/h$$
and in my textbook they simplify it to this, but don't show why! I am confused (question(a)):
$$Secant slope = \Delta y/ \Delta x = 32h - 8h^2/h$$
I can see where the $-8h^2$ comes from, but can't seem to figure out how it gets to $32h$
My calculus teacher really doesn't explain things well, she went over how to solve this but I still don't understand. Can someone explain how to solve? This isn't a homework question by the way this is truly for my own understanding.