`a)`
`A=(2x+1)(x-2)-x(2x-3)+7`
`A=(2x^2-3x-2)-(2x^2-3x)+7`
`A=2x^2-3x-2-2x^2+3x+7`
`A=(2x^2-2x^2)+(3x-3x)+(7-2)`
`A=5`
``
`b)`
`B=(x-1)^2-2(x^2-1)+(x+1)^2`
`B=(x^2-2x+1)-(2x^2-2)+(x^2+2x+1)`
`B=x^2-2x+1-2x^2+2+x^2+2x+1`
`B=(x^2-2x^2+x^2)+(2x-2x)+(1+1+2)`
`B=4`
``
`c)`
`C=(x+3)^2-(x-1)(x+1)-10(x+2)+1`
`C=(x^2+6x+9)-(x^2-1)-(10x+20)+1`
`C=x^2+6x+9-x^2+1-10x-20+1`
`C=(x^2-x^2)+(6x-10x)+(9+1+1-20)`
`C=-4x-9`
``
`d)`
`D=(x-2)(x+2)+2(2-x)^2-4(x-2)(x+3)`
`D=(x^2-2^2)+2(x^2-4x+4)-4(x^2+x-6)`
`D=x^2-4+2x^2-8x+8-4x^2-4x+24`
`D=(x^2+2x^2-4x^2)+(-8x-4x)+(-4+8+24)`
`D=-x^2-12x+28`
