Solution :*****************************************We KNOW the ALGEBRAIC identity ,(a+b+c)² = a²+b²+c²+2ab+2bc+2ca******************************************Now ,( X + 2y + 4Z )²=x²+(2y)²+(4z)²+2x(2y)+2(2y)(4z)+2(4z)x= x² + 4y² + 16z² + 4xy + 16yz + 8zx•••••
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