0 \\ p^2-9p>0 \\ p^2-9p=0 \\ p(p-9)=0 \\ p_1=0 \\ p_2=9 \\ p \in (-\infty;\ 0)\cup(9;\ +\infty)" alt="px^2-2px+9=0 \\ D=(-2p)^2-4p*9=4p^2-36p>0 \\ p^2-9p>0 \\ p^2-9p=0 \\ p(p-9)=0 \\ p_1=0 \\ p_2=9 \\ p \in (-\infty;\ 0)\cup(9;\ +\infty)" align="absmiddle" class="latex-formula">