bonjour pourriez vous m'aider pour cette exercice. merci bcp

1) Tu calcules :
A(0) = 2 x 0 + 1 = 1
A(4) = 2 x 4 + 1 = 9
A(x) = 16 <=> 2x + 1 = 16 <=> 2x = 15 <=> x=7,5
A(x) = 17 <=> 2x + 1 = 17 <=> 2x = 16 <=> x=8

2) Tu calcules :
B(0) = 2(0+1) = 2
B(4) = 2(4+1) = 10
B(x) = 16 <=> 2(x+1) = 16 <=> 2x + 2 = 16 <=> 2x = 14 <=> x=7
B(x) = 17 <=> 2(x+1) = 17 <=> 2x + 2 = 17 <=> 2x = 15 <=> x=7,5

1) On sait que A = 2x + 1

x          0            4            7,5              8
A        1            9            16              17

2x + 1 = 2(0) + 1 = 1
2x + 1 = 2(4) + 1 = 8 + 1 = 9

2x + 1 = 16
2x = 16 - 1
2x = 15
x = 15/2
x = 7,5

2x + 1 = 17
2x = 17 - 1
2x = 16
x = 16/2
x = 8

2) On sait que B = 2 (x + 1)

x                0              4                   7                    7,5
B                1           10                  16                    17

B = 2 (x + 1) = 2 (0 + 1= 1
B = 2 (x + 1) = 2 (4 + 1) = 8 + 2 =10

B = 2 (x + 1)
2 (x + 1) = 16
2x + 2 = 16
2x = 16 - 2
2x = 14
x = 14/2
x = 7

B = 2 (x + 1)
2 (x + 1) = 17
2x + 2 = 17
2x = 17 - 2
2x = 15
x = 15/2
x = 7,5