0
\\\
x^2-5x+15=0
\\\
D=25-60<0
\\\
x\in R
" alt="x^2-5x+15 >0
\\\
x^2-5x+15=0
\\\
D=25-60<0
\\\
x\in R
" align="absmiddle" class="latex-formula">
0
\\\
2x^2-11x+12 =0
\\\
D=121-96=25
\\\
x_1= \frac{11+5}{4} =4
\\\
x_2= \frac{11-5}{4} =1.5
\\\
x\in (-\infty; 1,5) \cup (4; +\infty)" alt=" \frac{-2}{2x^2-11x+12} \leq 0
\\\
\frac{2}{2x^2-11x+12} \geq 0
\\\
2x^2-11x+12 >0
\\\
2x^2-11x+12 =0
\\\
D=121-96=25
\\\
x_1= \frac{11+5}{4} =4
\\\
x_2= \frac{11-5}{4} =1.5
\\\
x\in (-\infty; 1,5) \cup (4; +\infty)" align="absmiddle" class="latex-formula">