



1) Степень многочлена равна 4.
2)

Есть множитель, который делится на 7, значит, и все произведение делится на 7. Доказано.
3) 
0} \atop {(2x^2-1)^2\geq0 }} \right. =>7*(2x^2-1)^2\geq 0" alt="\left \{ {{7>0} \atop {(2x^2-1)^2\geq0 }} \right. =>7*(2x^2-1)^2\geq 0" align="absmiddle" class="latex-formula">
Доказано.