(2x-3)(2x+3)+(4-5x)(x+2)=(2x)²-3²+4x+8-5x²-10x

                                        =4x²-9+4x+8-5x²-10x

                                        =4x²-5x²+4x-10x-9+8

(2x-3)(2x+3)+(4-5x)(x+2)=-x²-6x-1