Question

a) (x-4)²-(x-1)²
b) (x+1)²-(x-2)²
c) (-x+3)²-2x(4-x)

Answer 1

Oi Flor

a) (x - 4)² - (x - 1)² = x² - 8x + 16 - x² + 2x - 1 = -6x + 15 

b) (x + 1)² - (x - 2)² = x² + 2x + 1 - x² + 4x - 4 = 6x - 3

c) (-x + 3)² - 2x*(4 - x) = x² - 6x + 9 - 8x + 2x² = 3x² - 14x + 9