4z^2 ─ x^2 + 2xy ─ y^2
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Step-by-step explanation:
4z²-x²+2xy-y²
= (2z)²-(x²-2xy+y²)
=(2z)²-(x-y)². {use a²-b²=(a+b)(a-b)}
={2z+(x-y)}{2z-(x-y)}
=(x-y+2z)(2z-x+y)
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