e) 3² - 48. g) z² + 4z - 21. i) -21y² + 4xy + x². k) 4z¹ - 201³ -96z². 10 nr f) 2rw²-2rt². h) 1²+52-36. j) 2x² - 20x - 22. 1) z²z+13xz+36z.

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