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ChloeSand
@ChloeSand
April 2019
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Quelqu'un m'aide ? :)
Développer et simplifier ( 4√5 + 2 )²
Voila le problème qui me bloque :)
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celine84660
Il faut utiliser les identités remarquables, ici du type (a+b)² = (a+b)(a+b)
d'où 4√5 x 4
√5 + 4
√5 x 2 + 2 x 4√5 + 2 x 2 = (4√5)² + 2(4
√5) + 2² = 80 + 18 + 4 = 102
1 votes
Thanks 1
ChloeSand
Merci :D
extremum
4√5 x 4√5 + 4√5 x 2 + 2 x 4√5 + 2 x 2 = (4√5)² + 16√5 + 2² et non (4√5)² + 2(4√5) + 2² et même le reste est faux
extremum
( a + b )² = a² + 2ab + b²
( 4√5 + 2 )² = (4√5)² + 2 × 4√5 × 2 + 2²
= 4²√5² + 16√5 + 4
= 16 × 5 + 16√5 + 4
= 80 + 16√5 + 4
= 84 + 16√5
1 votes
Thanks 1
ChloeSand
Merci Extremum <3<3 :D
extremum
de rien :)
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Lista de comentários
d'où 4√5 x 4√5 + 4√5 x 2 + 2 x 4√5 + 2 x 2 = (4√5)² + 2(4√5) + 2² = 80 + 18 + 4 = 102
( 4√5 + 2 )² = (4√5)² + 2 × 4√5 × 2 + 2²
= 4²√5² + 16√5 + 4
= 16 × 5 + 16√5 + 4
= 80 + 16√5 + 4
= 84 + 16√5