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OpenStudy (anonymous):
Find all values of x (if any) where the tangent line to the graph of the given equation is horizontal. HINT [The tangent line is horizontal when its slope is zero.] (If an answer does not exist, enter DNE. Enter your answers as a comma-separated list.) y = −9x2 − 8x
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OpenStudy (psymon):
Do you know how to take the derivative of this?
OpenStudy (anonymous):
no
OpenStudy (psymon):
Have you been shown derivatives at all?
OpenStudy (debbieg):
Given that it's a quadratic, I think you can get by without derivatives. Just think about where, for a quadratic, the tangent line would be horizontal. (Although, it does seem like an odd question to have in a class where derivatives haven't been covered) |dw:1379129894655:dw|
OpenStudy (debbieg):
|dw:1379130033030:dw|
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