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Bouchaksaya5
@Bouchaksaya5
May 2019
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Bonjour à tous ; merci à tous de répondre aux calculs suivants: a.(X+2) fois (X+5) b.(a+9)(a +(-5)) c.(y+5)(8+y) d.(9+t)(10+t)
merci à tous de donner une réponse juste et valable.
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luwan
Verified answer
Bonjour,
* signifie multiplier
a) (x+2)(x+5)
= x² + 5x + 2x + 10
= x² + 7x + 10
b) (a+9)(a+(-5))
= (a+9)(a-5)
=a² - 5a + 9a - 45
= a² + 4a - 45
c) (y+5)(8+y)
= 8y + y² + 40 + 5y
= y² + 13y + 40
d) (9+t)(10+t)
= 90 + 9t + 10t + t²
= t² + 19t + 90
0 votes
Thanks 1
luwan
de rien ;)
luwan
oui pourquoi?
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Verified answer
Bonjour,* signifie multiplier
a) (x+2)(x+5)
= x² + 5x + 2x + 10
= x² + 7x + 10
b) (a+9)(a+(-5))
= (a+9)(a-5)
=a² - 5a + 9a - 45
= a² + 4a - 45
c) (y+5)(8+y)
= 8y + y² + 40 + 5y
= y² + 13y + 40
d) (9+t)(10+t)
= 90 + 9t + 10t + t²
= t² + 19t + 90