The LCM is defined as being a positive integer. Ignore the negative signs. Calculate as if everything's positive.
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You don't. The LCM refers to integers only.
The LCM of 3 and 9 is 9.
You need at least two numbers to find an LCM.Two or more numbers are needed to find the Lcm
The LCM of two numbers is sometimes the product of the two numbers.
If the GCF and the LCM are both 144, then so are both of the numbers.