(3a^2b)^2+8a^6b^3(-2a^2b) = -a^4b^2(4a^2b-3)(4a^2b+3)
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(3a^2b)^2+8a^6b^3(-2a^2b) = -a^4b^2(4a^2b-3)(4a^2b+3)
(3a^2b)^2+8a^6b^3(-2a^2b) = -a^4b^2(4a^2b-3)(4a^2b+3)
(3a^2b)^2+8a^6b^3(-2a^2b) = -a^4b^2(4a^2b-3)(4a^2b+3)
(3a^2b)^2+8a^6b^3(-2a^2b)
=9a^4b²-16a^8b^4
-a^4b^2(4a^2b-3)(4a^2b+3)
=-a^4b²(16a^4b²-9)
=-16a^8b^4+9a^4b²
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