Answer :

Part a

we have

x^2-4x+2^2---------> (x-2)^2

answer is +4

Part b

x^2+10x+5^2 --------> (x+5)^2

answer is +25

Part c

x^2-2x+1 -----> (x-1)^2

answer is +1

Part d

x^2+24x+12^2 -----> (x+12)^2

answer is +12

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