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```2
Solution.
Since the derivative of x2 is 2x, F (x) = x2 . Thus, by the FTC we have
2
Z
2xdx = F (2) â F (1) = 4 â 1 = 3.
1
Using a calculator we find
R2
1
2xdx = 3
Example 5.5.2
Let F (t) represent a bacteria population which is 5 million at time t = 0.
After t hours, the population is growing at an instantaneous rate of 2t million
bacteria per hour. Estimate the total increase in the bacteria population
during the first hour, and the population at t = 1.
Solution.
Since total change is the definite integral of F 0 (t) = 2t from t = 0 to t = 1,
we have
Z 1
Change in population = F (1) â F (0) =
2t dt â 1.44 million bacteria.
0
Since F (0) = 5, we find
Z
F (1) = F (0) +
1
2t dt â 5 + 1.44 = 6.44 million.
0
If C(q) is the total cost to produce a quantity q of a certain comodity then we
can use the Fundamental Theorem of Calculus and compute the total cost
of producing b units as follows
b
Z
C 0 (q)dq
C(b) â C(0) =
0
or
Z
C(b) = C(0) +
b
C 0 (q)dq.
0
We call the quantity
Rb
0
C 0 (q)dq the total variable cost
```
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