(2x+3y+4z) (4x² + 9y² +16z² - 6xy -12yz - 8zx) simplify the following
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2x + 3y + 4z) (4x2 + 9y2 + 16z2 - 6xy - 12yz - 8zx)
= (2x + 3y + 4z) ((2x)2 + (3y)2 + (4z)2 - 2x × 3y - 3y × 4z - 4z × 2x)
= (2x)3 + (3y)3 + (4z)3 - 3 × 2x × 3y × 4z
= 8x3 + 27y3 + 64z3 - 72xyz
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