0\; \; |\cdot 10\\\\10x^2-26x+160>0\\\\D/4=13^2-10\cdot 160=-1431<0\; ,\; a=10>0\; \; \Rightarrow \; \; \boxed {x\in (-\infty ,+\infty )}" alt="x^2-2,6x+16>0\; \; |\cdot 10\\\\10x^2-26x+160>0\\\\D/4=13^2-10\cdot 160=-1431<0\; ,\; a=10>0\; \; \Rightarrow \; \; \boxed {x\in (-\infty ,+\infty )}" align="absmiddle" class="latex-formula">