16x2 + 4y2 + 25z2 - 16xy + 20yz - 40zx નું મૂલ્ય _______ જેટલું છે.

1
(4x + 2y - 5z)2
2
(4x - 2y - 5z)2
3
(4x + 2y + 5z)2
4
(4x - 2y + 5z)2

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