Expand (2x+3y-z) ^2
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Step-by-step explanation:
→ (a + b - c)² = a² + b² + c² + 2ab - 2bc - 2ca
→ a= 2x
→ b= 3y
→ c= z
→ (2x)² + (3y)² + (z)² + 2(2x)(3y) - 2(3y)(z) - 2(z)(2x)
→ 4x² + 9y² + z² + 12xy - 6yz - 4zx
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