2*14, 4*7, 7*4 and 14*2 (leaving out 1*28 and 28*1)
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28 can be written as a product of factors in the following ways: 1 x 28 = 28 2 x 14 = 28 4 x 7 = 28 -1 x -28 = 28
You can write it as 4*N or 4N.
4xy - 2xy
336
Every product of two prime numbers has four factors.
No. It is a sum of four terms which can be simplified to a sum of three terms.