\(a,\left(x-2y\right)^2=x^2-4xy+4y^2\)
\(b,\left(2x^2+3\right)^2=4x^4+12x^2+9\)
\(c,\left(x-2\right)\left(x^2+2x+4\right)=x^3-8\)
\(d,\left(2x-1\right)^3=8x^3-12x^2+6x-1\)
a)(x-2y)2
=x2-4xy+4y2
b)(2x2+3)2
=4x4+12x+9
c)(x-2)(x2+2x+4)
=x3-8
d)(2x-1)3
=8x3-12x+6x+1