`a)(2x+3)^2=4x^2+12x+9`
`b)(6-3y)^2=36-36y+9y^2`
`c)(y-4)(y+4)=y^2-16`
`d)(x/2 - 4)^2=x^2/4-4x+16`
`e)(x+3)^3=x^3+9x^2+27x+27`
`f)(x-2/5)^3=x^3-6/5x^2+12/25x-8/125`
`g)(3x^2+y/4)^3=27x^6+27x^4.y/4+9x^2.y^2/16+y^3/64`
`h)(-2/3x^3-3/2y^2)^3=-8/27x^9-2x^6y^2-9/2x^3y^4-27/8y^6`
`i)((3x)/y-(2y)/x)^3=(27x^3)/y^3-(54x^2y)/(xy^2)+(36xy^2)/(x^2y)-(8y^3)/(x^3)`
`k)(x+2/3)^2(x-2/3)^2=x^4-16/81`
