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sofiakhe
@sofiakhe
June 2021
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On donne la fonction suivante :
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Chronophage
F(x) = 4x² - 5
f(3) = 4x3² - 5
f(3) = 4x9 - 5
f(3) = 36 - 5
f(3) = 31.
f(-1) = 4x(-1)² - 5
f(-1) = 4x1 - 5
f(-1) = 4 - 5
f(-1) = -1.
f(1/2) = 4x(1/2)² - 5
f(1/2) = 4x1/4 - 5
f(1/2) = 1 - 5
f(1/2) = -4.
- 5 = 4 x x² - 5
- 5 + 5 = 4 x x² -5 +5
0 = 4 x x²
x = 0
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f(3) = 4x3² - 5
f(3) = 4x9 - 5
f(3) = 36 - 5
f(3) = 31.
f(-1) = 4x(-1)² - 5
f(-1) = 4x1 - 5
f(-1) = 4 - 5
f(-1) = -1.
f(1/2) = 4x(1/2)² - 5
f(1/2) = 4x1/4 - 5
f(1/2) = 1 - 5
f(1/2) = -4.
- 5 = 4 x x² - 5
- 5 + 5 = 4 x x² -5 +5
0 = 4 x x²
x = 0