9(x-y)2-16(y-z)2
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9(x-y)2-16(y-z)2
9(x-y)2-16(y-z)2
9(x-y)2-16(y-z)2
9(x-y)²-16(y-z)²
=3²(x-y)²-4²(y-z)²
=(3x-3y)²-(4y-4z)²
=【(3x-3y)+(4y-4z)】【(3x-3y)-(4y-4z)】
=(3x+y-4z)(3x-7y+4z)
(3x-3y)^2-(4y-4z)^2=(3x-3y+4y-4z)(3x-3y-4y+4z)=(3x+y-4z)(3x-7y+4z)
9(x+z)2-16(y+z)2=?
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