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Unformatted text preview: -4 and not 2-x 2-3 x + 4 . 5. You can not simplify summands in fractions, i.e., the following simpli-cation is wrong : x 2 + 8 x-4 = x 2 + 6 8 x- 6 4 = x 2 + 2 x-1 2 The following are useful rules. 1. a b c d = ad bc (1) i.e., "the rst times the inverse of the second". For example: 1 2 3 4 = 1 4 2 3 = 4 6 2. a x a y = a x + y . 3. ( a x ) y = a xy . 4. log( a + b ) is not equal to log( a )+log( b ) . However, the following is true: log( ab ) = log( a )+log( b ) . The statements made here do not depend on which basis of log we are using. 5. log( a b ) = b log( a ) . 6. log( a b ) = log( a )-log( b ) ....
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This note was uploaded on 09/26/2008 for the course MAT 127 taught by Professor Guan-yushi during the Fall '07 term at SUNY Stony Brook.
- Fall '07