Factorise 4x²+9y²+16z²+12xy+24xyz+16xz
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4x² + 9y² + 16z² + 12xy + 24yz + 16xz
(2x)² + (3y)² + (4z)² + 2*2x*3y + 2*3y*4z + 2*2x*4z
(2x + 3y + 4z)²
Identity used ↓
(a + b + c)² = a² + b² + c² + 2ab + 2bc + 2ca
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