First, determine the slope of the tangent line. Take note that the slope of a line tangent to the curve is equal to the derivative of the function at the point of tangency. So taking the derivative of the function, f'(x) will be:
f'(x) = d/dx (x^3)
f'(x) = 3x^2
The given point of tangency is (1,1). Plugging in x=1 to the derivative yields:
f'(1) = 3(1)^2
f'(1) = 3
Hence, the slope of the line tangent to the function at (1,1) is m = 3.
Then, apply the point slope-form to get the equation of the tangent line.
y - y_1 =m(x - x_1)
y - 1 = 3(x - 1)
Isolating the y, it becomes:
y - 1 =3x - 3
y = 3x - 2
Thus, the equation of the tangent line is y = 3x - 2 .
Then, determine the intersection points of y = x^3 and y = 3x - 2. To do so, set the two y's equal to each other.
y = y
x^3 = 3x - 2
Take note that to solve polynomial equation, one side should be zero.
x^3 - 3x + 2 = 0
Then factor the left side using grouping method.
x^3 - x - 2x + 2=0
(x^3 - x) + (-2x + 2) = 0
x(x^2 - 1) - 2(x - 1) = 0
x(x-1)(x+1) - 2(x - 1) = 0
(x - 1)[x(x + 1) - 2] = 0
(x - 1)(x^2+x-2)=0
(x - 1)(x-1)(x + 2)=0
(x-1)^2(x + 2) = 0
Set each factor equal to zero.
(x-1)^2 = 0
x - 1=0
x=1
x + 2=0
x=-2
Then, plug-in the x values to either y=x^3 or y = 3x - 2, to get the y coordinates of the intersection.
x=1
y = 1^3=1
x=-2
y=(-2)^3 = -8
So, the two equations intersect at (1,1) and (-2,-8). Hence, bounded region of y = x^3 and y = 3x - 2 is:
To determine the area of the bounded region, draw a vertical strip. (See attached image.)
In the figure, the top of the vertical strip touches the graph of y=x^3. And its lower end touches the graph of y = 3x-2. Also, the bounded region starts at x=-2 and ends at x=1.
Applying the formula
A = int_a^b (y_(_(upper)) - y_(_(lower)))dx
the integral needed to compute the area of the bounded region is:
A = int_(-2)^1 (x^3-(3x-2))dx
Evaluating the integral, it results to:
A = int_(-2)^1 (x^3 -3x + 2)dx
A = (x^4/4 - (3x^2)/2+2x) |_(-2)^1
A = (1^4/4 - (3*1^2)/2+2*1) - ((-2)^4/4- (3*(-2)^2)/2+2*(-2))
A =3/4-(-6)
A=27/4
Therefore, the area of the bounded region is 27/4 square units.
Thursday, September 6, 2012
f(x) = x^3 , (1,1) Set up and evaluate the definite integral that gives the area of the region bounded by the graph of the function and the tangent line to the graph at the given point.
Subscribe to:
Post Comments (Atom)
Why is the fact that the Americans are helping the Russians important?
In the late author Tom Clancy’s first novel, The Hunt for Red October, the assistance rendered to the Russians by the United States is impor...
-
The poem contrasts the nighttime, imaginative world of a child with his daytime, prosaic world. In the first stanza, the child, on going to ...
-
There are a plethora of rules that Jonas and the other citizens must follow. Again, page numbers will vary given the edition of the book tha...
-
The given two points of the exponential function are (2,24) and (3,144). To determine the exponential function y=ab^x plug-in the given x an...
-
Robinson Crusoe, written by Daniel Defoe, is a novel. A novel is a genre defined as a long imaginative work of literature written in prose. ...
-
Hello! This expression is already a sum of two numbers, sin(32) and sin(54). Probably you want or express it as a product, or as an expressi...
-
The title of the book refers to its main character, Mersault. Only a very naive reader could consider that the stranger or the foreigner (an...
-
The only example of simile in "The Lottery"—and a particularly weak one at that—is when Mrs. Hutchinson taps Mrs. Delacroix on the...
No comments:
Post a Comment