`(2x-1)^2-(x+3)(3x-5)`

`=(2x)^2-2.2x.1 +1^2 -(3x^2-5x+9x-15)`

`=4x^2-4x+1-3x^2+5x-9x+15`

`=(4x^2-3x^2)+(-4x+5x-9x)+(1+15)`

`=x^2-8x+16`

`=x^2 -2.x.4 +4^2`

`=(x-4)^2`

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