4m²-4m+1-4+12-9m²
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4m²-4m+1-4+12-9m²
4m²-4m+1-4+12-9m²
4m²-4m+1-4+12-9m²
4m²-4m+1-4+12-9m²
=﹙4-9﹚m²-4m+﹙1-4+12﹚
=-5m²-4m+9
4m²-4m+1-4+12-9m²
4m²-4m+1-4+12-9m²
4m²-4m+1-4+12-9m²
4m²-4m+1-4+12-9m²
=﹙4-9﹚m²-4m+﹙1-4+12﹚
=-5m²-4m+9