(2x-3)的2次方(-2x-3)的2次方
=(2x-3)的2次方(2x+3)的2次方
=[(2x-3)(2x+3)]^2
=(4x^2-9)^2
=16x^4-72x^2+81
(2x-3)^2(-2x-3)^2
=(2x-3)^2[-(2x+3)]^2
=(2x-3)^2(2x+3)^2
=[(2x-3)(2x+3)]^2
=[4x^2-9]^2
=16x^4-72x^2+81
(2x-3)^2-(-2x-3)^2
=(2x-3)^2-(2x+3)^2
=[4x^2-12x+9]-[4x^2+12x+9]
=-24x