first, see if you can group the terms. i will first put this in latex to make it easier to understand. we have , and we can factor a out of the first group, and a out of the other group, to get let's multiply everything by -1 now to ge t multiplying all this does not change it, because -1^2=1.
because a^2-b^2=(a+b)(a-b), we get out final answer as .
the point slope form of a line is . since the slope is -5/6 then m=-5/6. since the line goes through point (8,-4) then substitute and simplify.
the equation becomes