Question

(2x - 1)2 - (x+ 2)2 = -2x

Answer 1

Vamos là.

(2x - 1)² - (x + 2)² = -2x

4x² - 4x + 1 - x² - 4x - 4 + 2x = 0

3x² - 6x - 3 = 0

x² - 2x - 1 = 0

a = 1

b = -2

c = -1

delta

d² =  4 + 4 = 8

d = 2√2

x1 = (2 + 2√2)/2 = 1 + √2

x2 = (2 - 2√2)/2 = 1 - √2