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math

posted by on .

from the expression below, which one is not factorable?
1)x^2+4x+6
2) 3ab^2-16a
3)x^2-441
4)4x^2+19x-5

I thought the answer was 2) b is not in the second part of the equation(the 16a)
Is this correct?
Thanks for checking my work

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