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OpenStudy (anonymous):
Determine the point on the graph of f(x)=-3x^3 where the tangent line at this point is perpendicular to the line y=4x-1.
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OpenStudy (ranga):
Slope of the line y=4x-1 is 4. The slope of the perpendicular line will be -1/4. f(x) = -3x^3 slope = f'(x) = -9x^2 Equate the slope -9x^2 to -1/4 and solve for x.
OpenStudy (radar):
@starshine what did you get for x?
OpenStudy (radar):
|dw:1389742726347:dw|
OpenStudy (radar):
|dw:1389742803085:dw|
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