25a^4x²z^10- 9b^6y²z^10=
=z^10(25a^4x²-9b^6y²)
(9a^4-4b^6)a²b² - 12a²b^8=
=9a^6b²-4a^b^8 - 12a²b^8=
=9a^6b² - 16a²b^8=
=a²b²(9a^4-16b^6)
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25a^4x²z^10- 9b^6y²z^10=
=z^10(25a^4x²-9b^6y²)
(9a^4-4b^6)a²b² - 12a²b^8=
=9a^6b²-4a^b^8 - 12a²b^8=
=9a^6b² - 16a²b^8=
=a²b²(9a^4-16b^6)