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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