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Sagot :

1) vrai:

h(0)= 7-3×0²

h(0)= 7- 0

h(0)= 7

2) faux:

h(7)= 7-3×7²

h(7)= 7-3×49

h(7) = 7-147

h(7)= -140

3) vrai

(pareil que le 1)

4) vrai

h(2)= 7-3×2²

= 7-3×4

= 7-12

= -5

h(-2)= 7-3×(-2)²

= 7-3×4

= 7-12

= -5

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