a: =(2x+1+2x-1)^2=(4x)^2=16x^2
b: =(x-1)(x+1)(x+2)-(x-2)(x^2+2x+4)
\(=x^3+2x^2-x-2-x^3+8=2x^2-x+6\)
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a: =(2x+1+2x-1)^2=(4x)^2=16x^2
b: =(x-1)(x+1)(x+2)-(x-2)(x^2+2x+4)
\(=x^3+2x^2-x-2-x^3+8=2x^2-x+6\)