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GAGABROQUEDIS
Answered

bonjour pouvez-vous m'aider?
Développer et réduire, si possible.
A = 7x + 3x(x − 2)
C = 3 (4 + 5a) – 2 (4 + 3a)
E = 5b (−2b – 4) − b (3b – 7)

merci d'avance :)

Sagot :

Bonjour,

A = 7x + 3x(x − 2)

= 7x +3x² -6x

= 3x² +x

C = 3 (4 + 5a) – 2 (4 + 3a)

= 12 +15a - 8 -6a

= 9a + 4

E = 5b (−2b – 4) − b (3b – 7)

= -10b²  -20b -3b² +7

= -13b²  -13

= -13( b² +1)

CHRYSTINE

bonjour

A = 7x + 3x(x − 2)

=7x+3x²-6x

=3x²+x

C = 3 (4 + 5a) – 2 (4 + 3a)

=12+15a-8-6a

=4+9a

E = 5b (−2b – 4) − b (3b – 7)

=-10b²-20b-3b²+7b

=-13b²-13b

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