Suppose f and g are functions such that lim f(x) = 5, %3D X3 lim f(x) = 2, and lim g(x) = 4. Given this information, calcu- x4 %3D %3D X3 late the limits that follow, if possible. If it is not possible with the given information, explain why. 13. lim(2f(x) – 3g(x)) 14. lim -2f (x) X→3 X→3 15. lim f(x) 16. lim f(x)g(x) X→7 X4 f(x) – 3 8(x) 17. lim 18. lim f(g(x)) X→3 x3

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Chapter1: Functions
Section1.2: Functions Given By Tables
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1.5
Limit Rules and Calculating Basic Limits
135
Suppose f and g are functions such that lim f(x) = 5,
lim f(x) = 2, and lim g(x) = 4. Given this information, calcu-
late the limits that follow, if possible. If it is not possible with
the given information, explain why.
ual
X3
x4
X3
in
an
13. lim(2f(x) – 3g(x))
14. lim -2f(x)
X3
X→3
15. lim f(x)
16. lim f(x)g(x)
X4
17. lim
x→3
f(x) – 3
8(x)
18. lim f(g(x))
X→3
x² - 1
19. Graph the functions f(x) = x +1 and g(x) =
X-1
and show that they are equal everywhere except at one
point. Then show that f (x) and g(x) have different values,
but the same limit, at this point.
4-x2
20. Graph the functions f(x) = 2 – x and g(x) =
and show that they are equal everywhere except at one
point. Then show that f (x) and g(x) have different values,
but the same limit, at this point.
21. In the Squeeze Theorem for limits, we require that 1(x) <
f(x) < u(x) for all x sufficiently close to c, but we do
not require this inequality to hold at the point x= c.
Why not?
%3D
x+2
Transcribed Image Text:1.5 Limit Rules and Calculating Basic Limits 135 Suppose f and g are functions such that lim f(x) = 5, lim f(x) = 2, and lim g(x) = 4. Given this information, calcu- late the limits that follow, if possible. If it is not possible with the given information, explain why. ual X3 x4 X3 in an 13. lim(2f(x) – 3g(x)) 14. lim -2f(x) X3 X→3 15. lim f(x) 16. lim f(x)g(x) X4 17. lim x→3 f(x) – 3 8(x) 18. lim f(g(x)) X→3 x² - 1 19. Graph the functions f(x) = x +1 and g(x) = X-1 and show that they are equal everywhere except at one point. Then show that f (x) and g(x) have different values, but the same limit, at this point. 4-x2 20. Graph the functions f(x) = 2 – x and g(x) = and show that they are equal everywhere except at one point. Then show that f (x) and g(x) have different values, but the same limit, at this point. 21. In the Squeeze Theorem for limits, we require that 1(x) < f(x) < u(x) for all x sufficiently close to c, but we do not require this inequality to hold at the point x= c. Why not? %3D x+2
Expert Solution
Step 1

Given:

  • limx3f(x)=5
  • limx4f(x)=2
  • limx3g(x)=4

13)

Determine limx32f(x)-3g(x).

limx32f(x)-3g(x)=2limx3f(x)-3limx3g(x)=2(5)-3(4)=10-12=-2

Therefore, limx32f(x)-3g(x)=-2.

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