(4x-5)² = (5x+1)² - (3x+8)² | binomische Formeln
16x^2 - 40x + 25 = 25x^2 + 10x + 1 - (9x^2 + 48x + 64) | Klammer auflösen
16x^2 - 40x + 25 = 25x^2 + 10x + 1 - 9x^2 - 48x - 64
16x^2 - 40x + 25 = 16x^2 -38x -63
- 40x + 25 = -38x -64 | + 40x + 63
88 = 2x
44 = x