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b. 5a ( -3a + 2b ) - 4b ( -3a + 2b )
= -15a² + 10ab + 12ab - 8b²
= -15a² + 22ab - 8b²
c. 5a ( 3a² - 2a - 4 ) + 6 ( 3a² - 2a - 4 )
= 15a³ - 10a² - 20a + 18a² - 12a - 24
= 15a³ - 10a² + 18a² - 20a - 12a - 24
= 15a³ + 8a² - 32a - 24