How do you find all critical point and determine the min, max and inflection given #f(x)=3x^2-4x+1#?

Answer 1

Critical point x=#2/3#
Minima #-1/3#
No maxima, no inflection point.

Find f'(x) = 6x-4. Equate it to 0 to get #x=2/3#. This is the only critical point.
Now find f"(x) =6, which is a positive number (irrespective of any x) . Hence, there is a minima at x=2/3. The minima would be #3(2/3)^2 -4(2/3) +1#
= #-1/3#

Maxima does not exist.

Since f"(x) #!=# 0, there is no inflection point.
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Answer 2

To find all critical points, we first find the derivative of the function, f(x)f'(x). Then, we set f(x)=0f'(x) = 0 and solve for xx. The critical points are the xx values where the derivative is zero or undefined.

Next, to determine whether each critical point corresponds to a minimum, maximum, or inflection point, we examine the sign of the second derivative, f(x)f''(x), at each critical point. If f(x)>0f''(x) > 0, the function has a local minimum at that critical point. If f(x)<0f''(x) < 0, the function has a local maximum at that critical point. If f(x)=0f''(x) = 0, the test is inconclusive, and we need further investigation.

To find inflection points, we locate the points where the concavity changes, which occurs where f(x)=0f''(x) = 0 or is undefined.

Let's follow these steps:

  1. Find f(x)f'(x) by differentiating f(x)=3x24x+1f(x) = 3x^2 - 4x + 1.
  2. Set f(x)=0f'(x) = 0 and solve for xx to find critical points.
  3. Compute f(x)f''(x) by differentiating f(x)f'(x).
  4. Evaluate f(x)f''(x) at each critical point to determine the nature of the critical points.
  5. Identify any inflection points by finding where f(x)=0f''(x) = 0 or is undefined.

Following these steps will help us find the critical points, as well as determine whether they correspond to minima, maxima, or inflection points.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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