Answer:
12.x²+5x+4=(x+4)(x+20x²)
13.a²-6a+8=(a-3)((a-4)
14.m²+7mn-30n²=
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Verified answer
Answer:
12.x²+5x+4=(x+4)(x+20x²)
13.a²-6a+8=(a-3)((a-4)
14.m²+7mn-30n²=