Solving Exponential and Logarithmic Equations
[Pages:8]Algebra 2 Honors - Mr. Allen-Black
Name___________________________________ ID: 1
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Solving Exponential and Logarithmic Equations
Date________________
CLASS EXAMPLES - EXPONENTIAL EQUATIONS: Solve each equation.
1) 53a = 52a + 2
2) 322x = 24
EXPONENTIAL EQUATIONS: Solve each equation.
3) 625 x + 1 = 25 x
4) 363m = 216-m
5) 3-3n - 2 = 33n - 1
6) 643x = 16
CLASS EXAMPLES: Solve each equation. Round your answers to the nearest ten-thousandth.
7) 10a + 10 = 46
8) ea = 26
9) 107x = 12
10) en - 2 - 5 = 61
Worksheet by Kuta Software LLC
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Solve each equation. Round your answers to the nearest ten-thousandth.
11) 4x = 72
12) eb - 2 = 12
13) er - 7 = 57
14) 13-10r + 2 = 48
CLASS EXAMPLES: Solve each equation. (LOGS ON BOTH SIDES)
15) log 4 (b2 + 11) = log 4 (-10b + 2)
16) ln (x + 4) + ln 3 = ln 63
17) log 9 - log (x - 2) = log 49
6
6
6
18) log (x2 + 9) + log 2 = log 36
Solve each equation.
19) ln (2k + 7) = ln (-k - 8)
20) ln -5v = ln (3v + 3)
21) log 20 (n2 + 6n) = log 20 (-20 - 3n)
22) log 4 -3x - log 4 2 = log 4 43
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Worksheet by Kuta Software LLC
23) log 4 3x2 - log 4 6 = 3
24) ln x - ln (x - 2) = ln 28
CLASS EXAMPLES: Solve each equation. (LOGS ON ONE SIDE)
25) log 4 n = 0
26) ln ( p + 2) = 3
27) 1 + log 8 5r = 5
28)
log
2
9 + log 2
4x2 = 4
Solve each equation. 29) log n = 2
8
30) log (n + 7) = 4 9
31) log 2 9r = 3
32) 2 log 8 x = -2
33) 10 log 5 x = 0
34) 2 log 10n = 6
35) log (x + 6) - log x = 5
3
3
36) log 2x + log 8 = 1
7
7
Worksheet by Kuta Software LLC
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37) log 5 (x2 - 10) + log 5 9 = 1
38) log 7 4x2 + log 7 4 = 4
39) Sophie is buying a used car for $4,500.00. The car is depreciating at a rate of 5% each month. a) Write an equation which models the value of the car after "x" months. b) How much will the car be worth after 8 months? c) When will the car's value be $2,000?
40) William has a goat farm with 6 goats. It is predicted that the goat population will grow at a rate of 20% each year. a) Write an equation which will model the number of goats he has after "x" years. b) How many goats will William have after 10 years? c) How long will it take William to end up with a herd of 20 goats?
41) Mr. Allen-Black deposited $3,200 into a savings account, which pays him 3.5% APR. a) How much will Mr. Allen-Black have accrued in the account after 5 years if the interest is compounded quarterly? b) How much less (or more?) would Mr. Allen-Black have accrued in 5 years if the interest were compounded continuously? c) How many years would it take Mr. A-B to accrue $10,000 considering the interest is compounded quarterly? d) How many years would it take Mr. A-B to accrue $10,000 if the interest was compounded continuously?
Worksheet by Kuta Software LLC
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Algebra 2 Honors - Mr. Allen-Black
Name___________________________________ ID: 1
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Solving Exponential and Logarithmic Equations
Date________________
CLASS EXAMPLES - EXPONENTIAL EQUATIONS: Solve each equation.
1) 53a = 52a + 2
2) 322x = 24
{2}
{
2 5
}
EXPONENTIAL EQUATIONS: Solve each equation.
3) 625 x + 1 = 25 x
4) 363m = 216-m
{-2}
{0}
5) 3-3n - 2 = 33n - 1
{ }1
6
6) 643x = 16
{
2 9
}
CLASS EXAMPLES: Solve each equation. Round your answers to the nearest ten-thousandth.
7) 10a + 10 = 46
8) ea = 26
1.5563
3.2581
9) 107x = 12 0.1542
10) en - 2 - 5 = 61 6.1897
Worksheet by Kuta Software LLC
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Solve each equation. Round your answers to the nearest ten-thousandth.
11) 4x = 72
12) eb - 2 = 12
3.085
4.4849
13) er - 7 = 57 4.1589
14) 13-10r + 2 = 48 -0.1493
CLASS EXAMPLES: Solve each equation. (LOGS ON BOTH SIDES)
15) log 4 (b2 + 11) = log 4 (-10b + 2) {-9, -1}
16) ln (x + 4) + ln 3 = ln 63 {17}
17) log 9 - log (x - 2) = log 49
6
6
6
{ }107 49
18) log (x2 + 9) + log 2 = log 36 {3, -3}
Solve each equation.
19) ln (2k + 7) = ln (-k - 8)
No solution.
21) log 20 (n2 + 6n) = log 20 (-20 - 3n)
No solution.
20) ln -5v = ln (3v + 3)
{ }3
8
22) log 4 -3x - log 4 2 = log 4 43
{ }86
3
Worksheet by Kuta Software LLC
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23) log 4 3x2 - log 4 6 = 3
{8 2, -8 2}
24) ln x - ln (x - 2) = ln 28
{ }56
27
CLASS EXAMPLES: Solve each equation. (LOGS ON ONE SIDE)
25) log 4 n = 0
{1}
26) ln ( p + 2) = 3
{e3 - 2}
27) 1 + log 8 5r = 5
{ }4096 5
Solve each equation. 29) log n = 2
8
{64}
28)
log
2
9 + log 2
4x2 = 4
{ } 2 2 , 33
30) log (n + 7) = 4 9 {6554}
31) log 2 9r = 3
{
8 9
}
33) 10 log 5 x = 0
{1}
32) 2 log 8 x = -2
{
1 8
}
34) 2 log 10n = 6
{100}
35) log (x + 6) - log x = 5
3
3
{ }3
121
36) log 2x + log 8 = 1
7
7
{ }7
16
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Worksheet by Kuta Software LLC
37) log 5 (x2 - 10) + log 5 9 = 1
{ } 95 95
, -
3
3
38) log 7 4x2 + log 7 4 = 4
{ } 49 49 , 44
39) Sophie is buying a used car for $4,500.00. The car is depreciating at a rate of 5% each month. a) Write an equation which models the value of the car after "x" months. b) How much will the car be worth after 8 months? c) When will the car's value be $2,000? a) y = 4500 ? 0.95x b) $2,985.39 c) 15.81 months
40) William has a goat farm with 6 goats. It is predicted that the goat population will grow at a rate of 20% each year.
a) Write an equation which will model the number of goats he has after "x" years.
b) How many goats will William have after 10 years?
c) How long will it take William to end up with a herd of 20 goats? a) y = 6 ? 1.2x b) 37.15 goats c) 6.604 Years
41) Mr. Allen-Black deposited $3,200 into a savings account, which pays him 3.5% APR.
a) How much will Mr. Allen-Black have accrued in the account after 5 years if the interest is compounded quarterly?
b) How much less (or more?) would Mr. Allen-Black have accrued in 5 years if the interest were compounded continuously?
c) How many years would it take Mr. A-B to accrue $10,000 considering the interest is compounded quarterly?
d) How many years would it take Mr. A-B to accrue $10,000 if the interest was compounded continuously? a) $3809.09 b) $2.90 more c) 32.70 yrs. d) 32.56 yrs.
Worksheet by Kuta Software LLC
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