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Example: 30 and 42 Factor them. 2 x 3 x 5 = 30 2 x 3 x 7 = 42 Combine the factors, eliminating duplicates. 2 x 3 x 5 x 7 = 210, the LCM The LCD is the same process, except it's a denominator.
You must use the process of "multiplication"that you learned in the 5th or 6th grade.
(45)2 = (45) x (45) = 2,025Because that's the definition of the 'square' process.
For example: x2-49 = (x-7)(x+7) For example: 16x2-25 = (4x-5)(4x+5)
It's the same process as finding least common multiples. Example: 1/30 and 1/42 Factor them. 2 x 3 x 5 = 30 2 x 3 x 7 = 42 Combine the factors, eliminating duplicates. 2 x 3 x 5 x 7 = 210, the LCD