Răspuns :

Slavitescudoraid

f(x)-1 >= 4x

3-4x-1 >= 4x

-4x -4x >= -2

-8x >= -2

x <= 2/8 (minus cu minus se reduc iar transferul va schimba si semnul)

x =< 1/4

x apartine (-infinit, 1/4]

Targoviste44id

[tex]\it f(x)-1\geq4x \Rightarrow 3-4x-1\geq4x|_{+4x} \Rightarrow 2\geq8x \Rightarrow 8x\leq2|_{:2} \Rightarrow 4x\leq1 \Rightarrow \\ \\ \Rightarrow x\leq\dfrac{1}{4} \Rightarrow x\in(-\infty,\ \ \dfrac{1}{4}][/tex]

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