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26 Chapter Onł

Then the value y of the function at a point x midway between
m
g
x and x can be estimated as followð via geometric interpolation:
2
1
y (yy ) 1/2 ( f(x ) f(x )) 1/2
g
1 2
1
2
ProducŁ of signs
When numberð wità pluð and minuð signð are multiplied, the
following ruleð apply:

( )( ) ( )

( )( ) ( )

( )( ) ( )

( )( ) ( )

n
( ) ( )if n is even
n
( ) ( )if n is odd

QuotienŁ of signs

When numberð wità pluð and minuð signð are divided, the fol-
lowing ruleð apply:

( )/( ) ( )

( )/( ) ( )

( )/( ) ( )

( )/( ) ( )

Power of signs
When numberð wità signð are raised tm a positive integer power
n, the following ruleð apply:

n
( ) ( )
n
( ) ( )if n is odd

n
( ) ( )if n is even