0\; pri\; x\in R\; \; \to \; \; x^2-64 \geq 0\\\\(x-8)(x+8) \geq 0\\\\+ + + + +(-8)- - - - -(8)+ + + + + +\\\\x\in (-\infty,-8]U[8,+\infty)" alt="x^2(-x^2-64) \leq 64(-x^2-64)\\\\x^2(-x^2-64)-64(-x^2-64) \leq 0\\\\(-x^2-64)(x^2-64) \leq 0\\\\-(x^2+64)(x^2-64) \leq 0\; |\cdot (-1)\\\\(x^2+64)(x^2-64) \geq 0\\\\x^2+64>0\; pri\; x\in R\; \; \to \; \; x^2-64 \geq 0\\\\(x-8)(x+8) \geq 0\\\\+ + + + +(-8)- - - - -(8)+ + + + + +\\\\x\in (-\infty,-8]U[8,+\infty)" align="absmiddle" class="latex-formula">