Question

(2x-3)ao quadrado + (x-5)(x+5)-(x+4)ao quadrado=

Answer 1

(2x - 3)² + (x - 5)(x + 5) - (x + 4)² =
4x²- 2.2x.3 + 9) + x² + 5x - 5x - 25 - x² + 2.x.4 +16
4x² - 12x + 9 +  x² + 5x - 5x - 25 - x² + 8x + 16
4x² + x² - x² - 12x + 5x - 5x + 8x + 9 - 25 + 16
4x² - 4x