Réponse:
f(3) = 36
f(-2) = 31
f(0) = 3
f(2/3) = 23/9
Explications étape par étape:
f(x) = 5x² - 4x + 3
• f(3) = 5×3² - 4×3 +3
= 5×9 - 12 + 3
= 45 - 9
= 36
• f(-2) = 5×(-2)² - 4×(-2) + 3
= 5×4 + 8 + 3
= 20 + 11
= 31
• f(0) = 5×0² - 4×0 + 3
= 5×0 + 3
= 3
• f(2/3) = 5×(2/3)² - 4×(2/3) + 3
= 5×(4/9) - 8/3 + 3
= 20/9 - 8/3 + 3
= 20/9 - (8×3/3×3) + (3×9/1×9)
= 20/9 - 24/9 + 27/9
= 23/9
