bonjour

f (x) = x² + 1.5

tu calcules 2 images pour tracer la courbe

f ( 0) = 1.5

f ( 2) = 4 + 1.5 = 5.5

g (x) = x² - 1

g ( 0) = - 1

g ( 2) =  4 - 1 = 3

f (x) = 0.5 x²

f ( 2 ) = 0.5 * 4 = 2

f ( - 3 ) = 0.5 * ( - 3 )² = 4.5

g (x) = - 3 x²

g ( 0 ) = 0

g ( 2) = - 3 * 4 = - 12