Question

19 Calcule: a) (5x - 1) . (5x + 1)
b) (a + b).(a + b)​

Answer 1

Explicação passo-a-passo:

(5x - 1).(5x + 1)

25x² + 5x - 5x - 1

25x² - 1

(a + b).(a + b)

a² + ab + ab + b²

a² + 2ab+ b²

(2x² - 3x - 6).(5x - 2)

10x³ - 6x² - 15x² + 6x - 30x + 12

10x³ - 21x² - 24x + 12

(2a + 3/5b).(a - 1/2b)

2a² - 2a/2b + 3a/5b - 3/10b²

2a² + a/b - 3/10b²