Corrigé du 35 P. 22
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\[\begin{aligned} u_0 &= 2\;;& \\ u_1 &= u_0 - 4 = 2 - 4 = -2\;;& \\ u_2 &= u_1 - 4 = -2 - 4 = -6\;;& \\ u_3 &= u_2 - 4 = -6 - 4 = -10\;;& \\ u_4 &= u_3 - 4 = -10 - 4 = -14\;;& \end{aligned}\]