Asked by Sam
For what values of a and b does the function f(x)=ax^3+bx have a minimum or maximum at x=2?
Answers
Answered by
Damon
dy/dx = 0 at max or min = 3 a x^2 + b
so when
3 a (4) + b = 0
b = -12 a
so when
3 a (4) + b = 0
b = -12 a
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