factors of 4a2+9b2-25-12 ab are
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4a^2+9b^2-12ab-25
(2a)^2+(3b)^2-(2×2a×3b)-25
(2a-3b)^2-25
(2a-3b)^2-(5)^2
(2a-3b-5) (2a-3b+5)
(2a)^2+(3b)^2-(2×2a×3b)-25
(2a-3b)^2-25
(2a-3b)^2-(5)^2
(2a-3b-5) (2a-3b+5)
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