bonjour
1 ) ( 3 x + 4 ) ( 5 x + 7 )
= 15 x² + 21 x + 20 x + 28
= 15 x² + 41 x + 28
2) ( 3 y + 2 ) ( 5 y - 6 )
= 15 y² - 18 y + 10 y - 12
= 15 y² - 8 y - 12
3 ) ( 5 a - 3 ) ( 2 + 6 a )
= 10 a + 30 a² - 6 - 18 a
= 30 a² - 8 a - 6
4 ) ( 8 x - 4 ) ( 5 x - 6 )
= 40 x² - 48 x - 20 x + 24
= 40 x² - 68 x + 24
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bonjour
1 ) ( 3 x + 4 ) ( 5 x + 7 )
= 15 x² + 21 x + 20 x + 28
= 15 x² + 41 x + 28
2) ( 3 y + 2 ) ( 5 y - 6 )
= 15 y² - 18 y + 10 y - 12
= 15 y² - 8 y - 12
3 ) ( 5 a - 3 ) ( 2 + 6 a )
= 10 a + 30 a² - 6 - 18 a
= 30 a² - 8 a - 6
4 ) ( 8 x - 4 ) ( 5 x - 6 )
= 40 x² - 48 x - 20 x + 24
= 40 x² - 68 x + 24