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a2+16 cannot be factored. There are no two numbers whose product is 16 and whose sum is 0.
One is 2 x 2 and the other is 3 x 3, so the LCM is the product, ie 36.
a²-a = a(a-1)
you do (245x)
There are several dimensions of quality for manufactured products and rendered services. These include the cost and longevity of the product or service.