Pouvez m’aider s’il vous plaît .

bonjour

A (x)  = ( x + 2 ) ( x - 3 ) + ( x - 3 )

A (x) = x² - 3 x + 2 x - 6 + x - 3

A (x) = x² - 9

A ( 3) = 9 - 9 = 0

B (x) = ( 2 x - 3 )²

b (x) = 4 x² - 12 x + 9

B ( 1.5) = 4 * 1.5² - 12 *1.5 + 9 = 9 - 18 + 9 = 0

a) P  = 2 ( 4 x + 7 + 2 x + 4 )

P = 8 x + 14 + 4 x + 8

P = 12 x + 22

A =   ( 4 x + 7 ) ( 2 x + 4 )

A =  8 x² + 16 x + 14 x + 28

A = 8 x² + 30 x + 28

Réponse :

bonjour,

A(x) = ( x+2) (x-3) +(x-3)

= x² - 3x + 2x - 6 + x -3

=x² - 9

B(x) = (2x - 3 )²

= (2x)² - 2 × 2x×3 + 3²

=4x² - 12x + 9

A(3) =x² -9

= 3² - 9

= 9 -9

=0

B(1.5) =4x² - 12x + 9

= 4 × 1.5² - 12 × 1.5 + 9

=4×2.25 - 18 + 9

=9 - 18 + 9

= 0

P = 2 ( (4x + 7)+ (2x +4) )

= 2 ( 4x + 7 + 2x + 4 )

= 2 ( 6x + 11 )

= 12x + 22

A = longueur × largeur

A = (4x + 7 ) ( 2x +4)

A = (4x + 7 ) ( 2x +4)

= 8x² +16x + 14x + 28

=8x² + 30x +28

voila:)