3. Write the expanded form of (x + y-z)2
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Answer:
x²+y²+z²+2xy-2yz-2xz
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(x + y - z)²
= x² + y² + (-z)² + 2xy + 2y(-z) + 2(-z)x
= x² + y² + z² + 2xy - 2yz - 2zx
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