MA 141 Midterm: MA 141 NCSU Practice3Sol

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turquoisegnu128

15 Feb 2019

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Read all of the following information before starting the exam: complete each problem. Show all of your work clearly and in order and justify your answers, as partial credit will be given when appropriate and there may be no credit given for problems without supporting work. Circle or otherwise indicate your nal answers your nal answers. All answers should be completely simpli ed, unless otherwise stated. Use linear approximation to nd f (a + h) for f (x) = 1 cos x , a = . Solution: for linear approximation we rst need f (x) = sin x cos2 x , then we use the formula: f (a + h) f (a) + f (a)h = A rectangle with base on the x-axis has its upper vertices on the curve y = 3 x2. Solution: the area of the rectangle is given by a(x) = 2x(3 x2) and it reaches the maximum when a (x) = 6 6x2 = 0.

Related Questions

1. (45 marks) Short-Answer Questions. Put your answer in the box provided but show your work also. Each question is worth 3 marks, but not all questions are of equal difficulty. Full marks will be given for correct answers placed in the box, but at most 1 mark will be given for incorrect answer. Unless otherwise stated, it is not necessary to simplify your answers in this question. a) Find the equation of the tangent plane to the graph of the function z = f(x,y) = sell at (0,1). Answer b) Evaluate (T, 0) if f(x,y) = sin(ry). Answer c) Graph of a function z = f(x,y) is given by: Which of the following level curves correspondes to this function. Answer d) If f(x,y) = e(3x – 2y), find lim - Math)-f(x,y) e) Find % if f(x, y) = x2 - y3 and 2 = r sin(t), y = r cos(t). Answer f) Evaluate the directional derivative of f(x, y) = !at (1, -1) in the direction of u =(2, 1). Answer 8) Does Simono converge? h) Sketch the direction field of the differential equation = 1-2y. i) Consider the differential equation ay = 15 - 31, y(0) = 0, and use Euler's method with step size 0.1 to estimate y(0.1). Answer j) Knowing that (-3,-3) is a critical point of f(x,y) = 2:3 + y2 – 4.cy -3.0, use the second derivative test to find out whether it is a local minimum, local maximum, or a saddle point. Answer k) Solve the initial value problem, dy dt 642 2y + cos(u) y(1) = . Answer 1) Is ū=(2,2, -1) perpendicular to v = (5,-4, 2)? Answer m) Find the area between the graph of y = 1 + sin(x) and y=1-sin(x) from 0 to 7. Answer n) Determine the lentgh of the curve y = 8/2,0 SIS 3. Evaluate and simplify your answer. Answer o) Express the volume of the solid obtained by rotating the bounded region that lies between curves y = (x-2)2 and y=1,150 $4 about the vertical line 2 = 5. Do not evaluate this integral. Answer

given the funcion F(x)=(x-1)^2/x^2+1

a) find the domain of the function in interval notation

b)Find the intercepts of the function. All work must be shown. Write your answer as ordered pair.

c) Find the equation of any asymptote.All work must be shown

d)Find the critical numbers.All work must be shown

e)Use the first derivative test to find the interval of increasing and decreasing. All work must be shown

f) Find the ordered pairs of the local maximum and minimum

g) Use the second derivative test to find the intervals of concavity and any inflection points. All work must be shown Including the number line with test numbers.

h) Graph the function on the grid provided. Label any intercepts, asymptotes,maxima,minima, and inflection points