The midpoint formula is x1+x2 over 2 and y1+y2 over 2. When you use it to find the midpoint of (0,-8) and (-4,10), you get (-2,1).
Slope formula is y2-y1 over x2-x1, which will give you -6.
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4x^2 + 7x - 5 - (3x^2 - 2x - 4) =
4x^2 + 7x - 5 - 3x^2 + 2x + 4 =
x^2 + 9x - 1 <==