(x+y)²-16(x-y)²
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(x+y)²-16(x-y)²(x+y)²-16(x-y)²(x+y)²-16(x-y)²(x+y)²-16(x-y)²
(x+y)²-16(x-y)²
(x+y)²-16(x-y)²
(x+y)²-16(x-y)²
(x+y)²-16(x-y)²=(x+y)²-[4(x-y)]²
=[﹙x+y﹚＋4﹙x-y﹚][﹙x+y﹚-4﹙x-y﹚]
=﹙5x-3y﹚﹙5y-3x﹚
利用平方差公式.