Bonjour,
1)
aire du carré:
(d+2) (d+2) =
d² +4d + 4 ( identité remarquable)
aire rectangle:
(d+2) ( d-3)
= d² -3d+ 2d -6
= d² -d -6
total:
d² +4d + 4 + d² -d -6
= 2d² +3d -2
2)
(d+2) (d+2) +(d+2) ( d-3)
= (d+2) ( d+2 + d-3)
= (d+2)( 2d -1)
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Bonjour,
1)
aire du carré:
(d+2) (d+2) =
d² +4d + 4 ( identité remarquable)
aire rectangle:
(d+2) ( d-3)
= d² -3d+ 2d -6
= d² -d -6
total:
d² +4d + 4 + d² -d -6
= 2d² +3d -2
2)
(d+2) (d+2) +(d+2) ( d-3)
= (d+2) ( d+2 + d-3)
= (d+2)( 2d -1)