[ x3 + 3x2 + 2x ] is a trinomial.
It's factors are [ x, (x + 1), (x + 2) ] .
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If a number cannot be factored it is a prime number.
Yes. Consider the trinomial x2 + 2x + 4. It can be factored as (x+2)(x+2), that is to say, it has two identical factors of (x+2).
x2+14x+40 = (x+4)(x+10) when factored
(X + 2)(X + 4) Factored
When factored it is: (x-9)(x+4)