Find the area between the curve y = x² + 12x + 27 and the x-axis from x = -3 to x = -1.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.6: The Inverse Trigonometric Functions
Problem 91E
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Find the area between the curve y = x² + 12x + 27 and the x-axis from x = -3 to x = -1.
Step 1
Notice that the curve is a parabola with x-intercepts (-3
-3 ,0) and (-9, 0). Within our interval
[-3, -1], f(x) is nonnegative
nonnegative
Step 2
Therefore, our function is continuous and f(x) 2 0 on [a, b], and we can use the definite interval as follows to
measure the area under the curve.
If fis a continuous function on [a, b] and f(x) > 0 on [a, b], then the exact area between y = f(x) and the
x-axis from x = a to x = b is given by
Area = rw) dx.
9.
Therefore, set up the definite integral for our function.
+ 12x + 27
1 + 12r + 27
dx
Step 3
Now we use the Fundamental Theorem of Calculus to evaluate the integral. First integrate and write the
9.
answer in the form
(x) dx = F(x)",
where F'(x) = f(x).
| (x²+ 12x + 27) dx =
-3
-3
Transcribed Image Text:Find the area between the curve y = x² + 12x + 27 and the x-axis from x = -3 to x = -1. Step 1 Notice that the curve is a parabola with x-intercepts (-3 -3 ,0) and (-9, 0). Within our interval [-3, -1], f(x) is nonnegative nonnegative Step 2 Therefore, our function is continuous and f(x) 2 0 on [a, b], and we can use the definite interval as follows to measure the area under the curve. If fis a continuous function on [a, b] and f(x) > 0 on [a, b], then the exact area between y = f(x) and the x-axis from x = a to x = b is given by Area = rw) dx. 9. Therefore, set up the definite integral for our function. + 12x + 27 1 + 12r + 27 dx Step 3 Now we use the Fundamental Theorem of Calculus to evaluate the integral. First integrate and write the 9. answer in the form (x) dx = F(x)", where F'(x) = f(x). | (x²+ 12x + 27) dx = -3 -3
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