a^2-16a+64 2. 4m^2+4m+1 3. 9a^2-24ab+16b^2 4. -m^2-m-1/4 5. x^2n-2x^n+1
(a - 8)^2
(2m + 1)^2
(3a - 4b)^2
-(m + 1/2)^2
(x^n - 1)^2
(a-8)^
(2m + 1)^
(3a - 4b)^
-(m + 1/2)^
(x^n - 1)^