<span>c^3 - 16c=c(c</span>²-16)=c(c-4)(c+4)<span>
3a^2 - 6ab + 3b^2=3(a</span>²<span>-2ab+b</span>²)=3(a-b)(a-b)<span>
y^2 - x^2 - 6x - 9=y</span>²-(x+3)²=(y+x+3)(y-x-3)<span>
81a^4 - 1=(9a</span>²-1)(9a²+1)=(3a-1)(3a+1)(9a²+1)
X^2+2xy+y^2-x^2+2xy-y^2=4xy
После подстановки: 4*0.5*0.5=1
<span>(m - n)</span>²<span> - p</span>² = (m - n - p)(m - n + p)
Формула разности квадратов