The domestication of plants led to more stationary settlements during the first agricultural revolution.

Yes, it is true that the domestication of plants (and animals) led to more stationary settlements during the First Agricultural Revolution, since this led to a surplus of food--meaning that people no longer had to "hunt and gather" for their food. 

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2. x2 + 8x + 12 = 0 to prove: x = -6 or x = -2