3(y-z)²-(2y＋z)(-y＋2y)

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3(y-z)²-(2y＋z)(-y＋2y)3(y-z)²-(2y＋z)(-y＋2y)3(y-z)²-(2y＋z)(-y＋2y)3(y²-2yz+z²)

3(y-z)²-(2y＋z)(-y＋2y)
3(y-z)²-(2y＋z)(-y＋2y)

3(y-z)²-(2y＋z)(-y＋2y)
3(y²-2yz+z²)-(-2y²+4y²-yz+2yz)=y²-7yz+3z²