Question

Desenvolva e Reduza
(x+1)²-(x-1)²

Answer 1

(x + 1)² = - (x - 1)²
x² + 2x + 1² = - (x² - 2x + 1²)
x² + 2x + 1 = - x² + 2x - 1
x² + x² + 2x - 2x + 1 + 1 = 0
2x² + 2 = 0

Answer 2

x²+2.x.1+1²-(x²-2.x.1+1²)
x²+2x+1-x²+2x-1

forma reduzida:
4x