Bonjour FrisVall
A) f(x) = 3x - 1
racine : 3x - 1 = 0 ==> 3x = 1 ==> x = 1/3
[tex]\begin{array}{|c|ccccc|} x&-\infty&&\frac{1}{3}&&+\infty \\ f(x)=3x-1&&-&0&+&\\ \end{array}[/tex]
B) g(x) = -5x - 7
racine : -5x - 7 = 0 ==> 5x = -7 ==> x = -7/5 = -1,4
[tex]\begin{array}{|c|ccccc|} x&-\infty&&-1,4&&+\infty \\ g(x)=-5x-7&&+&0&-&\\ \end{array}[/tex]
C) h(x) = 6x
racine : 6x = 0 ==> x = 0
[tex]\begin{array}{|c|ccccc|} x&-\infty&&0&&+\infty \\ h(x)=6x&&-&0&+&\\ \end{array}[/tex]
D) k(x) = 8 - 3x
racine = 8 - 3x = 0 ==> 3x = 8 ==> x = 8/3
[tex]\begin{array}{|c|ccccc|} x&-\infty&&\frac{8}{3}&&+\infty \\ k(x)=8-3x&&+&0&-&\\ \end{array}[/tex]
