\(1,x^2+4x+4=\left(x+2\right)^2=\left(398+2\right)^2=400^2=160000\\ 2,x^2-8x+16=\left(x-4\right)^2=\left(504-4\right)^2=500^2=250000\\ 3,x^3-6x^2+12x-8=\left(x-2\right)^3=\left(102-2\right)^3=100^3=10000\)
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