Question

Which ones are monomial perfect squared 6x^2,9x^8,16x^9,25x^12,36x^16

Answer 1

$9x^8=3^2(x^4)^2=\left(3x^4\right)^2\\\\25x^{12}=5^2(x^6)^2=\left(5x^6\right)^2\\\\36x^{16}=6^2(x^8)^2=\left(6x^8\right)^2$