Question

Simplifique a expressao:

(x + 4) (x - 4) + (x - 1)²

Answer 1

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

Answer 2

(x + 4) . (x - 4) + (x - 1)²

x.x - 4x + 4x - 4.4 + x² - 2.x.1 + 1²
x² -4x + 4x - 16 + x² - 2x + 1
x² - 16 + x² - 2x + 1
x² + x² - 2x + 1 - 16
=> 2x² - 2x - 15