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Sagot :

Bonjour,

→2x+7-x².

remplacer x par : -2,

=> 2*-2 +7 -4 = -1

-1,  

=> 2*-1 +7 -2 = 7

0 =>7

0.5, =>

2*0,5 +7 -0,25 = 7,75

1: => 2+7 -1 = 8

1.5 =>

2*1,5 +7 - 2,25= 7,75

2=> 7

3 => 4

4 => -1

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