identify if is it perfect square trinomial or not

1.x²+10x+25
2.x²+2x+1
3.y²-6y-9
4.k²-5k+25

[tex]5.m {}^{6} + 10m {}^{3} + 100[/tex]
6.a²b²-12ab+36

[tex]7.m {}^{4} - 14 m{}^{2} - 49 [/tex]
[tex]8.25x {}^{2} + 30xy + 9y {}^{2} [/tex]
[tex]9.4x {}^{3} + 2x + 9[/tex]
[tex]10.(a + 1) {}^{2} - 2(a + 1) + 1[/tex]
I need the answer now :((

W/explain, solution, etc.


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