Answer:
[tex]\large\boxed{c^2+10c+25=(c+5)^2}[/tex]
Step-by-step explanation:
[tex]METHOD\ 1:\\\\c^2+10c+25=c^2+5c+5c+25=c(c+5)+5(c+5)=(c+5)(c+5)\\\\\boxed{c^2+10c+25=(c+5)^2}\\\\METHOD\ 2:\\\text{use}\ (a+b)^2=a^2+2ab+b^2\\\\c^2+10c+25=c^2+2(c)(5)+5^2\\\\\boxed{c^2+10c+25=(c+5)^2}[/tex]
