(a)
To find: The value of the limit limyx→∞ for the given function y=x1+2x .
The value of the limit is limyx→∞=0 .
Given information:
The given function is y=x1+2x .
Formula used:
The notation limyx→∞=l means that y gets arbitrarily close to l as x gets arbitrarily large.
Sum rule of limits:
If limf(x)x→c and limg(x)x→c both exist, then limx→c[f(x)+g(x)]=limx→cf(x)+limx→cg(x) .
L’Hospital’s Rule:
If limf(x)x→c=limg(x)=0/±∞x→c and g′(x)≠0 for all x∈I with x≠c and limf′(x)x→climg′(x)x→c exists, then
limx→∞f(x)g(x)=limx→∞f′(x)g′(x)
Calculation:
The given function is: y=x1+2x
Substitute x=∞ in the denominator
2∞ means 2×2×2×2...... up to infinity which tends to infinity.
i.e. lim2x=∞x→∞
Calculate the limits:
limyx→∞=limx→∞(1+2x)
According to Sum rule of limits:
limyx→∞=lim1x→∞+lim2xx→∞
Substitute lim2x=∞x→∞ and lim1=1x→∞
in the above equation to obtain the required value of the limit:
lim(1+2x)x→∞=1+∞lim(1+2x)x→∞=∞
Therefore,
limyx→∞=limx→∞x1+2xlimyx→∞=∞∞
Since, limyx→∞=∞∞
Apply L’Hospital’s rule to obtain the required limit:
limy=x→∞limx→∞x1+2xlimyx→∞=limx→∞ddx(x)limx→∞ddx(1+2x)limyx→∞=limx→∞1limx→∞2xln2limyx→∞=1∞limyx→∞=0
Therefore, the required value of the limit is 0 .
(b)
To find: The value of the limit limyx→−∞ for the given function y=x1+2x .
The value of the limit is limyx→−∞=−∞ .
Given information:
The given function is y=x1+2x .
Formula used:
The notation limyx→∞=l means that y gets arbitrarily close to l as x gets arbitrarily large.
Sum rule of limits:
If limf(x)x→c and limg(x)x→c both exist, then limx→c[f(x)+g(x)]=limx→cf(x)+limx→cg(x) .
Quotient rule of limits:
If limf(x)x→c and limg(x)x→c both exist, then limx→∞f(x)g(x)=limf(x)x→∞limg(x)x→∞ .
Calculation:
The given function is: y=x1+2x
Substitute x=−∞
2−∞ means 12×12×12×12×...... up to infinity which tends to 0 .
i.e. lim2x=0x→−∞
Calculate the limits:
limyx→−∞=limx→−∞(1+2x)
According to Sum rule of limits:
lim(1+2x)x→−∞=lim1x→−∞+lim2xx→−∞
Substitute lim2x=0x→−∞ and lim1=1x→−∞
in the above equation to obtain the required value of the limit:
lim(1+2x)x→−∞=1+0lim(1+2x)x→−∞=1
Calculate the required limit:
limy=x→−∞limx→−∞x1+2x
Apply Quotient rule of limits:
limy=x→−∞limxx→−∞lim(1+2x)x→−∞
Substitute lim(1+2x)x→−∞=1 and limxx→−∞=−∞
in the above equation to obtain the required value:
limy=x→−∞−∞1limy=x→−∞−∞
Therefore, the required value of the limit is −∞ .
Chapter 11 Solutions
PRECALCULUS:GRAPHICAL,...-NASTA ED.
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