factor me to know my value !

1.
[tex]x2 + 6x = 16[/tex]
2.
[tex]x2 - 49 = 0[/tex]
3.
[tex]x2 + 121 = 22x[/tex]
4.
[tex]4x2 + 12x - 16 = 0[/tex]
5.
[tex]x2 - 81 = 0[/tex]


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