2a^3x^2-2a^3x^2-10a^2x=-10a^2x
Б) a^2+5a+5b-b^2=a^2-b^2+5(a+b)=(a+b)(a-b)+5(a+b)=(a+b)(a-b+5)
<span>х²<span>-</span><span>16<span>=</span>0</span></span>
<span>х²</span>=16
х=+-4
ответ:+-4