7-5C Live Review Lesson

4 Slides • 2 Questions

1

7-5C Live Review

2

Multiple Choice

Q1: $\log_3\left(n^2+4n\right)=\log_3\left(35+2n\right)$

1

5

2

5, -7

3

-3, 5

4

-7

3

$\log_3\left(n^2+4n\right)=\log_3\left(35+2n\right)$

$n^2+4n=35+2n$
$n^2+2n-35=0$
$\left(n+7\right)\left(n-5\right)=0$
$n=-7,\ n=5$
$n=-7,\ 5$

4

Multiple Choice

Q2: $\log_3\ x\ +\ \log_3\ 4\ =\ 4$

1

$\frac{27}{2}$

2

$\frac{3}{2}$

3

$\frac{9}{7}$

4

$\frac{81}{4}$

5

$\log_3\ x\ +\ \log_3\ 4\ =\ 4$

$\log_3\ 4x\ =\ 4$
$3^4=4x$
$81=4x$
$\frac{81}{4}=x$

6

Today:

Solving Exponential Equations Using Logs

7-5C Live Review

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