Question

( x-3)² - (x-2)² + ( x-1)²

Answer 1

(x-3)² = (x-3).(x-3)= x²-6x+9

- (x-2)² = (x-2).(x-2)= x²-4x+4

(x-1)² = (x-1).(x-1) = x²-2x+1


x²-6x+9 - x²-4x+4 + x²-2x+1 = 3x²-18x+29

Answer 2

(x-3)²-(x-2)²+(x-1)²
x²-3x-3x+9-(x²-2x-2x+4)+(x²-x-x+1)
x²-9x+9-x²+4x-4+x²-2x+1
x²-11x+4x+10-4
x²-7x+6