20. The formula for changing the base of a logarithm is:

a) Use MATLAB’s function log(x) to calculate .

b) Use MATLAB’s function log10(x) to calculate .

a b

c

α

a = 15 b = 35

(x0, y0) Ax + By + C = 0 d

Ax0 + By0 + C A2 + B2

= -------------------------------------

(3, –4) 2x – 7y – 10 = 0 Cn, r Cn, r n!

r!(n – r)!

= ----------------------

logaN logbN logba

= ---------------

log5 281 log7 1054