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Answer :

(m-21) (m+1)there I thinks it's right unless I messed up my work

Answer:

[tex](m - 21)(m + 1)[/tex]

Step-by-step explanation:

[tex]m^{2} - 20m - 21[/tex]

Lets split the middle term.

[tex]=> m^{2} - 21m + m - 21[/tex]

[tex]=> m(m - 21) + 1(m - 21)[/tex]

[tex]=> (m - 21)(m + 1)[/tex]