Bonjour !
A) 3(x+7)
= 3 x + 3 x 7
= 3 + 21
B) 2(x-5)
=2 x + 2 x (-5)
= 2 - 10
C) 7x(x+4)
= 7 x + 7 x 4
= 7² + 28
D)-9(2x-1)
=-9 x 2 - 9 x (-1)
= -18 +9
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Bonjour !
A) 3(x+7)
= 3 x + 3 x 7
= 3 + 21
B) 2(x-5)
=2 x + 2 x (-5)
= 2 - 10
C) 7x(x+4)
= 7 x + 7 x 4
= 7² + 28
D)-9(2x-1)
=-9 x 2 - 9 x (-1)
= -18 +9