x2+14x+49 = (x+7)(x+7) when factored
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Yes because if x2-14x+49 then it is (x-7)(x-7) when factored
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In a word, yes. Any simplified form that has 3 terms is a trinomial, but is often in the form ax2 +bx +c where a,b,c are real numbers.
2x2 + 21x + 49 = 2x2 +14x +7x + 49 = 2x(x + 7) + 7(x + 7) = (2x + 7)(x + 7)
Yes.