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)

*x*^{2}+ 5*x*+ 4(B)

*x*^{2}+ 9*x*+ 20(C)

*x*^{2}– 8*x*+ 7(D)

(E) 2*x*^{2 }– 7*x*+ 10*x*

^{2}– 5

*x*+ 2

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