Aidez moi en maths svp

bonjour,

f (x) = 1 / ( x² + 2)  

f ( -2) = 1 / (( - 2 )² + 2 ) = 1 / 6

f ( 0)=    1/2

f ( √2) = 1 / ( √2)² + 2 = 1 / 4

g (x) = x² + x - 5

g ( 4) = 16 + 4 - 5 = 15

g ( 6) = 36 + 6 - 5 = 37

g ( - 5) = 25  + 5 - 5 = 25

g ( 0) = - 5