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Verified answer
1) ( 3x + 5 )( 2x - 6 )= 3x•2x + 5•2x - 6•3x - 6•5
= 6x² + 10x - 18x - 30
= 6x² - 8x - 30
2) ( a - 3b )( 2a + 4b )
= a•a - 3b•2a + a•4b - 3b•4b
= a² - 6ab + 4ab - 12b²
= a² - 2ab - 12b²