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Given f(x) = 2x3 − 5x2 − 4x + 3.

Mathematics

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Answer

(2; -9)
Graph of f(x) = 2x³ − 5x² − 4x + 3

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Key points of f(x) = 2x³ − 5x² − 4x + 3
Pointxy
x-intercept−10
Maximum−0.333.7
y-intercept03
x-intercept0.50
Minimum2−9
x-intercept30

Step-by-step solution

4 steps
  1. Find the first derivative of f(x)f(x).

    Given f(x)=2x3−5x2−4x+3f(x) = 2x^3 - 5x^2 - 4x + 3.
    To find the turning points, we set the first derivative equal to zero.

    f′(x)=ddx(2x3−5x2−4x+3)=6x2−10x−4f'(x) = \frac{d}{dx}(2x^3 - 5x^2 - 4x + 3) = 6x^2 - 10x - 4
  2. Set f′(x)=0f'(x) = 0 and solve for xx.

    6x2−10x−4=06x^2 - 10x - 4 = 0

    Divide by 2 to simplify:

    3x2−5x−2=03x^2 - 5x - 2 = 0

    Factor the quadratic equation:

    (3x+1)(x−2)=0(3x+1)(x-2) = 0

    This gives two possible x-coordinates for the turning points:

    3x+1=0  ⟹  x=−133x+1 = 0 \implies x = -\frac{1}{3} x−2=0  ⟹  x=2x-2 = 0 \implies x = 2
  3. Find the second derivative f′′(x)f''(x) to classify the turning points.

    f′′(x)=ddx(6x2−10x−4)=12x−10f''(x) = \frac{d}{dx}(6x^2 - 10x - 4) = 12x - 10

    Evaluate f′′(x)f''(x) at each x-value:
    For x=−13x = -\frac{1}{3}:

    f′′(−13)=12(−13)−10=−4−10=−14f''\left(-\frac{1}{3}\right) = 12\left(-\frac{1}{3}\right) - 10 = -4 - 10 = -14

    Since f′′(−13)<0f''(-\frac{1}{3}) < 0, this corresponds to a local maximum (point M).

    For x=2x = 2:

    f′′(2)=12(2)−10=24−10=14f''(2) = 12(2) - 10 = 24 - 10 = 14

    Since f′′(2)>0f''(2) > 0, this corresponds to a local minimum (point N).

  4. Determine the y-coordinate of the minimum turning point N.

    Substitute x=2x=2 into the original function f(x)f(x):

    f(2)=2(2)3−5(2)2−4(2)+3f(2) = 2(2)^3 - 5(2)^2 - 4(2) + 3 f(2)=2(8)−5(4)−8+3f(2) = 2(8) - 5(4) - 8 + 3 f(2)=16−20−8+3f(2) = 16 - 20 - 8 + 3 f(2)=−4−8+3f(2) = -4 - 8 + 3 f(2)=−12+3f(2) = -12 + 3 f(2)=−9f(2) = -9

    The coordinates of the minimum turning point N are (2;−9)(2; -9).

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