Sagot :
Réponse :
Explications étape par étape
Bsr,
B = 4x(7 + 3x)= 28x +12x²
C = 8(5x – 4)= 40x - 32
D = (4x – 7) x 5x = 20x² -35x
E = 6(2a + 5) + 2(4a – 10) = 12a +30+8a-20 = 20a +10
F = (6x + 7)(4x + 5) = 24x² +30x +28x +35 = 24x² +58x +35
H = (6 − 2)² = (6-2)(6-2) =4*4 = 16
☺
Explications étape par étape
B = 4x ( 7 + 3x )
B = 28x + 12x²
B = 12x² + 28
C = 8 ( 5x - 4 )
C = 40x - 32
D = ( 4x - 7 ) × 5x
D = 5x ( 4x - 7 )
D = 20x² - 35x
E = 6 ( 2a + 5 ) + 2 ( 4a - 10 )
E = 12a + 30 + 8a - 20
E = 20a + 10
F = ( 6x + 7 )( 4x + 5 )
F = 24x² + 30x + 28x + 35
F = 24x² + 58x + 35
H = ( 6 - 2 )²
H = ( 6 - 2 )( 6 - 2 )
H = 36 - 12 - 12 + 4
H = 36 - 24 + 4
H = 16