The algebraic expression 25x2 + 16y2 + 9z2 - 40xy + 24yz - 30zx is equal to:

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

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