3 math questions help please!

[From: ] [author: ] [Date: 11-11-26] [Hit: ]

3.a^2 – 5a – 20
4.a^2 + 12ab + 27b^2
5.2a^2 + 30a + 100

3.urm this one doesn't quiet make sense...- u sure the q is correct?
4.(a+3b) (a+9b)
5. (a+10) (2a+10)

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