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x (x² -4).(x+5) ≤ 0
p=x ....raíz x=0
p------------------------(0)++++++++++++++++
q=x²-4 ...raízes x'=2 x'=-2
q++++++++(-2)------------------(2)+++++++++++++++++
s=x+5 ...raiz x+5=0 ==>x=-5
s--------------------------(-5)+++++++++++++++++
Estudo de sinais:
p------------------------------(0)++++++++++++++++
q+++++++++++(-2)------------------(2)+++++++++
s--------(-5)++++++++++++++++++++++++++++
pqs+++(-5)------(-2)+++(0)--------(2)++++++++++++
-5 ≤ x ≤2 U 0 ≤ x ≤ 2 ou [-5,-2] U [0,2]
p=x ....raíz x=0
p------------------------(0)++++++++++++++++
q=x²-4 ...raízes x'=2 x'=-2
q++++++++(-2)------------------(2)+++++++++++++++++
s=x+5 ...raiz x+5=0 ==>x=-5
s--------------------------(-5)+++++++++++++++++
Estudo de sinais:
p------------------------------(0)++++++++++++++++
q+++++++++++(-2)------------------(2)+++++++++
s--------(-5)++++++++++++++++++++++++++++
pqs+++(-5)------(-2)+++(0)--------(2)++++++++++++
-5 ≤ x ≤2 U 0 ≤ x ≤ 2 ou [-5,-2] U [0,2]
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