4x² +9y2 + 4z? – 12xy + 12yz - 8zx
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Answer:
(2x-3y)^2
Step-by-step explanation:
((4 • (x2)) - 12xy) + 3^2y^2
(2^2x^2 - 12xy) + 3^2y^2
4x^2 - 12xy + 9y^2
(2x - 3y)•(2x - 3y)
(2x-3y)^2
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