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Find all of the critical numbers for the function f(x) = x^3 – 8x^2 + 11x + 20
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critical numbers eh.... no interval to worry about?
f'(x) gives us some good numbers...
f'(x) = 3x^2 -16x +11 now make this equal to zero to determine our critical numbers...
16 +- sqrt(16^2 -(4)(11)(3)) ------------------------- 2(3)
16 +- 2sqrt(31) ------------- if I did it right 6
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you should have an inflection point at -16/6 thats critical as well
Okay I understand now, you used the quadratc equation,right?
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