math 1: basic arithmetic Flashcards
(if b is a positive number) |x|= b →
x = b or x = -b
(if b is a positive number) |x|
-b
(if b is a positive number) |x| > b →
xb
the product of several numbers is positive if the numbeer of
negative factors is even
the product of several numbers is negative if the number of
negative factors is odd
the first few primes are:
2, 3, 5, 7, 11, 13, 17, 19, 23
the product of the GCF and LCM of any two positive integers is equal to the
product of the two integers
(for any integers m and n) if either m or n is even, then mn is
even
(for any integers m and n) if both and n are odd, then mn is
odd
(for any integers m and n) if and n are both even or both odd, then m + n and m - n are
even
(for any integers m and n) if either m or n is even and the other is odd, then m + n and m - n are
odd
13²
169
14²
196
15²
225
√ab =
√a x √b
