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Lr7
@Lr7
April 2019
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Bonjour exercice noté pouvez-vous m aider svp
1 developper et réduire les deux expressions suivantes
a ( 7 x + 3) ² b ( 2 x - 3 ) ( 5 - x )
2 en déduire le developpement de :
a) ( 7 x + 3 )² + ( 2 x - 3 ) ( 5 - x ) b) ( 7 x + 3 )² - ( 2 x - 3 ) (5 - x )
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Thomas1106
1) a) ( 7x + 3 )² = (7x)²+2*7x*3+3² =
49x²+42x+9
b) ( 2x - 3 )*( 5 - x ) = 2x*5+2x*(-x)-3*5-3*(-x) = 10x-2x²-15+3x =
-2x²+13x-15
2)
a) ( 7x + 3 )² + ( 2x - 3 )*( 5 - x )
= 49x
²+42x+9-2x²+13x-15
=
47x²+55x-6
b) ( 7x + 3 )² - ( 2x - 3 )*(5 - x )
= 49x²+42x+9-(-2x²+13x-15)
= 49x²+42x+9+2x²-13x+15
=
51x²+29x+24
3 votes
Thanks 1
nonoduchablais
Salut :)
1)
a. ( 7 x + 3) ²
(7x)² + 2 x 7x x 3 + 3²
49x² + 42x + 9
b. ( 2 x - 3 ) ( 5 - x )
2x x 5 + 2x x (-x) - 3 x 5 - 3 x (-x)
10x - 2x² - 15 + 3x
-2x² + 13x - 15
2)
a.
( 7 x + 3 )² + ( 2 x - 3 ) ( 5 - x )
(49x² + 42x + 9) + (-2x² + 13x - 15)
47x² + 55x - 6
b. ( 7 x + 3 )² - ( 2 x - 3 ) (5 - x )
(49x² + 42x + 9) - (-2x² + 13x - 15)
49x² + 42x + 9 + 2x² - 13x + 15
51x² + 29x + 24
J'espère t'avoir aidé(e)! :)
3 votes
Thanks 1
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Bonjour :) pouvez vous m aidez svp l exercice est noter c est l exercice 3
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Lista de comentários
b) ( 2x - 3 )*( 5 - x ) = 2x*5+2x*(-x)-3*5-3*(-x) = 10x-2x²-15+3x = -2x²+13x-15
2)
a) ( 7x + 3 )² + ( 2x - 3 )*( 5 - x )
= 49x²+42x+9-2x²+13x-15
= 47x²+55x-6
b) ( 7x + 3 )² - ( 2x - 3 )*(5 - x )
= 49x²+42x+9-(-2x²+13x-15)
= 49x²+42x+9+2x²-13x+15
= 51x²+29x+24
1)
a. ( 7 x + 3) ²
(7x)² + 2 x 7x x 3 + 3²
49x² + 42x + 9
b. ( 2 x - 3 ) ( 5 - x )
2x x 5 + 2x x (-x) - 3 x 5 - 3 x (-x)
10x - 2x² - 15 + 3x
-2x² + 13x - 15
2)
a. ( 7 x + 3 )² + ( 2 x - 3 ) ( 5 - x )
(49x² + 42x + 9) + (-2x² + 13x - 15)
47x² + 55x - 6
b. ( 7 x + 3 )² - ( 2 x - 3 ) (5 - x )
(49x² + 42x + 9) - (-2x² + 13x - 15)
49x² + 42x + 9 + 2x² - 13x + 15
51x² + 29x + 24
J'espère t'avoir aidé(e)! :)