1. Rewrite the equation without using logarithms
ln A = 0.5 ln B ­ 5

2. Solve the simultaneous equations:
logx y =2
xy = 8

3. 7 is not a power of 5
the calculator works with log or ln.
Calculate log5 7 correct to 3 s.f.

4. • Solve logarithmic and exponential equations
applying basic logarithmic rules.
• Calculate and operate with natural logarithms.
• Deduce and apply the formula to change
the base of logarithms.
By the end of the lesson you will be able to:
LOGARITHMS

5. Change of base:
y = logab
re­write without using log:
apply logc to both sides:
make y the subject:

6. Calculate log5 7 correct to 3 s.f.
Calculate log7 19 correct to 3 s.f.

7. Express log9 x as a log3 :

8. Solve the equation:

9. Solve worksheet "Mixed review"
Solve Book pages 69­70