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= (5n - 2) ((2n - 1) (2n - 1))
= (5n - 2) (4n² - 4n + 1)
=5n (4n² - 4n + 1) -2 (4n² - 4n + 1)
=20n³ - 20n² + 5n - 8n² + 8n - 2
=20n³ - 28n² +13n - 2
2) 3xy + 6x² - 9xy²
= karena tidak ada yang sejenis
3) (5p² - 8p) + ( 3p² + 2p)
=5p² - 8p
3p² + 2p
------------- +
8p² - 7p
#semoga bermanfaat