Calculus

1. On what interval is the function f(x)=x^3-4x^2+5x concave upward?

2. For what values of x dies the graph of f(x)=2x^3-3x^2-6x+87 have a horizontal tangent?

Is there no solution because the equation can't be factored?

3. At what point on the curve y=1+2e^x - 3x is the tangent line parallel to the line 3x-y=5?

  1. 👍 0
  2. 👎 0
  3. 👁 829
  1. #1
    f' = 3x^2-8x+5
    f" = 6x-8
    f is concave up when f" > 0

    #2
    f' = 6x^2-6x-6
    maybe it cannot be factored, but since the discriminant is positive, it has real solutions. Use the quadratic formula to find them.

    #3 you want the slope to be 3.
    y' = 2e^x - 3
    so,
    2e^x - 3 = 3
    2e^x = 6
    e^x = 3
    x = ln 3
    y(ln3) = 1 + 6 - 3ln3 = 7-ln27
    So, the tangent line is

    y = 3(x-ln3) + 7-ln27

    See the graph at

    http://www.wolframalpha.com/input/?i=plot+y%3D1%2B2e^x+-+3x%2C+y%3D3%28x-ln3%29+%2B+7-ln27

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. Calculus Please Help

    A continuous function f, defined for all x, has the following properties: 1. f is increasing 2. f is concave down 3. f(13)=3 4. f'(13)=1/4 Sketch a possible graph for f, and use it to answer the following questions about f. A. For

  2. Calculus

    1. Locate the absolute extrema of the function f(x)=cos(pi*x) on the closed interval [0,1/2]. 2. Determine whether Rolle's Theorem applied to the function f(x)=x^2+6x+8 on the closed interval[-4,-2]. If Rolle's Theorem can be

  3. math please help me!

    Estimate the instantaneous rate of change of the function f(x) = x ln x at x = 1 and at x = 3. (Use h = 0.1, 0.01, 0.001, 0.0001, and so on. Round your answers to four decimal places.) f '(1) = f '(3) = What do these values

  4. Please check my Calculus

    1. Given f(x)=-6/x, choose the correct statement A. The graph of f is concave upward on the interval (negative infinity, 0) B. The graph of f is concave downward on the interval (negative infinity, 0) C. The graph of f is concave

  1. Calculus

    Consider the function of defined by f(x)=x^3/3-4/x a. Find the X values for the points of inflection. b. Determine the intervals where the function of f is concave up and concave down.

  2. AP Calculous

    let f be the function defined by f(x)=3X^5 -5X^3 +2 a) on what interval is f increasing? b) on what interval is the graph of f concave upward? c)Write the equation of each horizontal line tangent to the graph of f

  3. Calculus

    Suppose you know that f(x) is an odd functon on the domain of all real numbers and that the function is concave up on the intervals 0 < x < 3 and 5 < x and concave down on the interval 3 < x < 5. List ALL intervals on which the

  4. Calculus Please Check my answers

    f is a function that is differentiable for all reals. The value of f ′(x) is given for several values of x in the table below. The table: x -8,-3,0,3,8 f'(x)-4,-2,0,4,5 If f ′(x) is always increasing, which statement about

  1. math

    Given f(x)=cos(5x)on the closed interval [0,2π/5] Find the open intervals where f is concave down and the open intervals where f is concave up. Express your answers in interval notation with exact values.

  2. Calculus

    F(x) = x^5 ln x A) Find the interval on which f is increasing Find the interval on which f is decreasing B) Find the local minimum value of f C) find the inflection point (x,y) Find the interval in which f is concave up Find the

  3. Calculus, math

    Consider the function below. (If an answer does not exist, enter DNE.) f(x) = e^arctan(7x) I did the problem but I have mistakes on some items. I think the ff. are right: Vertical Asymptote: x = DNE Horizontal Asymptote: y =

  4. Calculus

    1. The function is continuous on the interval [10, 20] with some of its values given in the table above. Estimate the average value of the function with a Left Hand Sum Approximation, using the intervals between those given

You can view more similar questions or ask a new question.