Factorise the following:- 1. 36x2y2z4 - 54x5z2 + 90x4y2z2
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36 x² y² z⁴ - 54 x⁵ z² + 90 x⁴ y² z²
= 18 x² z² [2 y² - 3 x³ + 5 x² y² ]
= 18 x² z² [2 y² - 3 x³ + 5 x² y² ]
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