Решите неравенства!! -4х^2+13х+12 больше _0 Х^2-4х-5 меньше 0

1)[latex]-4 x^{2} +13x+12 \geq 0 [/latex] [latex]4 x^{2} -13x-12 \leq 0[/latex] [latex]D:169-4*4*-12= \sqrt{361} =19[/latex] [latex] x_{1} = \frac{13-9}{2*4} = \frac{1}{2} [/latex] [latex] x_{2} = \frac{13+9}{2*4} = \frac{11}{4} [/latex] Ответ: [[latex] \frac{1}{2} ; \frac{11}{4} [/latex]] 2)[latex] x^{2} -4x-5<0[/latex] [latex]D:16-4*1-5= \sqrt{36} =6[/latex] [latex] x_{1} = \frac{4-6}{2} =-1[/latex] [latex] x_{2} = \frac{4+6}{2} =5[/latex] Ответ:(-1;5)