4(χ-y)²-9﹙χ﹢y﹚² 2a³-4a²+2a
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4(χ-y)²-9﹙χ﹢y﹚² 2a³-4a²+2a
4(χ-y)²-9﹙χ﹢y﹚² 2a³-4a²+2a
4(χ-y)²-9﹙χ﹢y﹚² 2a³-4a²+2a
4(χ-y)²-9﹙χ﹢y﹚²
=(2χ-2y)²-﹙3χ﹢3y﹚²
=(2x-2y+3x+3y)(2x-2y-3x-3y)
=(5x+y)(-x-5y)
=-(5x+y)(x+5y)
2a³-4a²+2a
=2a(a²-2a+1)
=2a(a-1)²