- #1
ashleyrc
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Homework Statement
determine where the graph of the function f(x) = (x-4)/(x^2-7) has a horizontal tangent line.
Homework Equations
used quotient rule. factored and simplifiedThe Attempt at a Solution
came up with ((x^2-7)-(2x^2-8x))/(x^2-7)^2then set to 0, and came up with -x^2-8x-7=0
then to find the points where the graph has a horizontal tan line, i came up with 2 situations: -(x+7)(x+1) = -7, -1; or (-x-7)(x+1) = 7, -1. which one is right, and did i do the rest of it correctly/