1) pour J = 8 on a f(x) = x² - 8x + 12
2) f(x) = J/8)x² -Jx + 1.5J
= J/8 ( x² -8x + 8*1.5)
= J/8( x² - 8x + 12)
= J/8(x -2)(x - 6)
3) f(x) = 0 ; J/8(x -2)(x - 6) = 0 ⇒ (x - 2) = 0 ⇒ x = 2 ⇒
ou (x - 6) = 0 ⇒ x = 6
4) f(x) < 0 x ∈ ]2; 6[
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1) pour J = 8 on a f(x) = x² - 8x + 12
2) f(x) = J/8)x² -Jx + 1.5J
= J/8 ( x² -8x + 8*1.5)
= J/8( x² - 8x + 12)
= J/8(x -2)(x - 6)
3) f(x) = 0 ; J/8(x -2)(x - 6) = 0 ⇒ (x - 2) = 0 ⇒ x = 2 ⇒
ou (x - 6) = 0 ⇒ x = 6
4) f(x) < 0 x ∈ ]2; 6[