f(x)=x^3=12x-24
f'(x)=3x^2+12=0
3x^2=-12
x^2=-4
what is x. would it be x=-2 and 2
because i have to find the interval where the function is increasing or decreasing.
i already know how to find the answer but i just got confused on finding the zeros first
<<f(x)=x^3=12x-24
f'(x)=3x^2+12=0
3x^2=-12
x^2=-4
what is x. would it be x=-2 and 2
.. i have to find the interval where the function is increasing or decreasing.>>
If the symbol after the x^3 is supposed to be a +, and not an = (as you typed it), then f'(x) is always positve.
Setting f'(x) = leads to an imaginary answer: x = i or -i.
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