bonjour
f (x) = ( 3 x + 1 )² - 9
je ne refais pas 1 et 2 puisque tu as trouvé
f (x) = ( 3 x + 1 - 3 ) ( 3 x + 1 + 3 ) = ( 3 x - 2 ) ( 3 x + 4 )
f (0) = - 2 * 4 = - 8
f ( 2) = ( 6 - 2 ) ( 6 + 4 ) = 4 * 10 = 40
f ( - 1/3 ) = ( - 3/3 - 2 ) ( - 3 /3 + 4 ) = - 3 * 3 = - 9
f ( √2) = ( 3 √2 - 2 ) ( 3 √2 + 4 ) = 18 + 12 √2 - 6 √2 - 8 = 10 + 6 √2
f (x) = - 8
( 3 x + 1 )² - 9 = 9 x² + 6 x + 1 - 9 = 9 x² + 6 x - 8
9 x² + 6 x - 8 = - 8
9 x² + 6 x - 8 + 8 = 0
9 x² + 6 x = 0
3 x ( 3 x + 2 ) = 0
x = 0 ou - 2 /3
f (x) = 0
( 3 x - 2 ) ( 3 x + 4 ) = 0
x = 2/3 ou - 4 /3
f (x) = - 9
( 3 x + 1 )² - 9 = - 9
( 3 x + 1 )² = 0
( 3 x + 1 ) ( 3 x + 1 ) = 0
x = - 1/3
Copyright © 2024 ELIBRARY.TIPS - All rights reserved.
Lista de comentários
bonjour
f (x) = ( 3 x + 1 )² - 9
je ne refais pas 1 et 2 puisque tu as trouvé
f (x) = ( 3 x + 1 - 3 ) ( 3 x + 1 + 3 ) = ( 3 x - 2 ) ( 3 x + 4 )
f (0) = - 2 * 4 = - 8
f ( 2) = ( 6 - 2 ) ( 6 + 4 ) = 4 * 10 = 40
f ( - 1/3 ) = ( - 3/3 - 2 ) ( - 3 /3 + 4 ) = - 3 * 3 = - 9
f ( √2) = ( 3 √2 - 2 ) ( 3 √2 + 4 ) = 18 + 12 √2 - 6 √2 - 8 = 10 + 6 √2
f (x) = - 8
( 3 x + 1 )² - 9 = 9 x² + 6 x + 1 - 9 = 9 x² + 6 x - 8
9 x² + 6 x - 8 = - 8
9 x² + 6 x - 8 + 8 = 0
9 x² + 6 x = 0
3 x ( 3 x + 2 ) = 0
x = 0 ou - 2 /3
f (x) = 0
( 3 x - 2 ) ( 3 x + 4 ) = 0
x = 2/3 ou - 4 /3
f (x) = - 9
( 3 x + 1 )² - 9 = - 9
( 3 x + 1 )² = 0
( 3 x + 1 ) ( 3 x + 1 ) = 0
x = - 1/3