x² + 4y² + 25z² - 4xy + 20yz - 10zx
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Answer:
(x)2+(2y)2+(5z)2-2x(2y)+2(2y)(5z)-2(5z)x
(-x+2y+5z)2
(-x+2y+5z) (-x+2y+5z)
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0
Answer:
( x +2y- 5z)^2
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