x(x - 4)" alt=" {(x - 2)}^{2} > x(x - 4)" align="absmiddle" class="latex-formula">
{x}^{2} - 4x" alt=" {x}^{2} - 4x + 4 > {x}^{2} - 4x" align="absmiddle" class="latex-formula">
0" alt=" {x}^{2} - 4x + 4 - {x}^{2} +4x > 0" align="absmiddle" class="latex-formula">
0" alt="4 > 0" align="absmiddle" class="latex-formula">
Последнее неравенство является верным для любого х, а значит
x(x - 4)" alt=" {(x - 2)}^{2} > x(x - 4)" align="absmiddle" class="latex-formula">