Chap 5: Factorisation - Can they be factorised?

Can the following expressions be factorised?

Everyone of you have been assigned to one of these expressions.

Try to factorise them using methods you know (to-date)

(A)       x² + 5x + 4

(B)       x² + 9x + 20 

(C)       x² – 8x + 7 

(D)       x² – 7x + 10

(E)    2x² – 5x + 2