Odpowiedź:
[tex]a)\\\\4(x-3)^2-(2x-5)^2\geq 2\\\\4(x^2-6x+9)-(4x^2-20x+25)\geq 2\\\\4x^2-24x+36-4x^2+20x-25\geq 2\\\\-4x+11\geq 2\\\\-4x\geq 2-11\\\\-4x\geq -9\ \ /:(-4)\\\\x\leq \frac{9}{4}\\\\x\leq 2\frac{1}{4}[/tex]
[tex]c)\\\\-9(2-x)^2-(1-3x)(3x+1)\leq 11\\\\-9(4-4x+x^2)-(1-3x)(1+3x)\leq 11\\\\-36+36x-9x^2-(1-9x^2)\leq 11\\\\-36+36x-9x^2-1+9x^{2}\leq 11\\\\-37+36x\leq 11\\\\36x\leq 11+37\\\\36x\leq 48\ \ /:36\\\\x\leq \frac{48}{36}\\\\x\leq \frac{4}{3}\\\\x\leq 1\frac{1}{3}[/tex]
