x^2+4y^2+z^2+4xy-4yz-2zn factorise
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Answer:
(-x-2y+z)²
Step-by-step explanation:
We know the formula,
(a+b+c)²=a²+b²+c²+2ab+2bc+2ac
From formula,
x²+4y²+z²+4xy+(-4yz)+(-2zx) = (-x-2y+z)²
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