Odpowiedź :
a)
[tex]-3(4-2x) \geq 2x+4\\-12+6x \geq 2x+4\\6x-2x \geq 4+12\\4x \geq 16 /:4\\x \geq 4[/tex]
b)
[tex](x-2)(x+2) \leq (x-2)^2\\x^2-4 \leq x^2-4x +4\\x^2-x^2+4x \leq 4+4\\4x \leq 8 /:4\\x\leq2[/tex]
a)
[tex]-3(4-2x) \geq 2x+4\\-12+6x \geq 2x+4\\6x-2x \geq 4+12\\4x \geq 16 /:4\\x \geq 4[/tex]
b)
[tex](x-2)(x+2) \leq (x-2)^2\\x^2-4 \leq x^2-4x +4\\x^2-x^2+4x \leq 4+4\\4x \leq 8 /:4\\x\leq2[/tex]