1. find each value of x at which has a horizontal tangent line.
set = to 0
Key says the answer is x=1, and x=4.
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Originally Posted by hazecraze =
= How did you arrive at this equality? How did you go from "2x - 8 = 0" to "2x = 0 and 6x = 0"?
Instead, start with the factorization:
Set this equal to zero, and solve both factors, using the methods you learned back in algebra.
How did I not see that? Got it now though.
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