x(1-x)+(x-1)²
= x - x² + x² - 2x + 1
= -x + 1
(x-3)² - x² + 10x - 7
= x² - 6x + 9 - x² + 10x - 7
= 4x + 2
(x+2)² - (x-3)(x+1)
= x² + 4x + 4 - (x² - 2x - 3)
= x² + 4x + 4 - x² + 2x + 3
= 6x + 7
(x+4)(x-2) - (x-3)²
= x² + 2x - 8 - (x² - 6x + 9)
= x² + 2x - 8 - x² + 6x - 9
= 8x - 17
(x-2)² + (x-1)(x+5)
= x² - 4x + 4 + x² + 4x - 5
= 2x² - 1
(x+3)(x-3) - x(23+x)
= x² - 9 - 23x - x²
= -23x - 9
(1-2x)(5-3x) + (4-x)²
= 5 - 13x + 6x² + 16 - 8x + x²
= 7x² - 21x + 21
(x-2)(x+2) - (x-3)(x+1)
= x² - 4 - (x² - 2x - 3)
= x² - 4 - x² + 2x + 3
= 2x - 1
(x+1)² + (x-2)(x+2) - 4x
= x² + 2x + 1 + x² - 4 - 4x
= 2x² - 2x - 3
(x+2)² - (x+3)(x-3) + 10
= x² + 4x + 4 - (x² - 9) + 10
= x² + 4x + 4 - x² + 9 + 10
= 4x + 23
(x+4)² + (x+5)(x-5) - 2x(x+1)
= x² + 8x + 16 + x² - 25 - 2x² - 2x
= 6x - 9
(x-1)² - (x-4)(x+4) + (x+3)²
= x² - 2x + 1 - (x² - 16) + x² + 6x + 9
= x² + 4x + 26