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5. (2x+3y)³=(2x)³+3(2x)²(3y)+3(2x)(3y)²+3y)³
8x³+36x²y+54xy²+27y³
6. 4x² + 9y² + 16z²+ 12xy – 24yz – 16xz
= (2x)²+ (3y)² + (-4z)² + 2(2x)(3y) + 2(3y)(-4z) + 2(-4z)(2x)
= (2x + 3y – 4z)²
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