Question

(-2x + 1)² = 49 calcule as raizes

Answer 1

Raízes de:

(- 2x + 1)² = 49.....=> (- 2x + 1)² = 7²

........................................- 2x + 1 = + - 7.......(+ 7  ou - 7)

- 2x + 1 = 7.....=> - 2x = 7 - 1....=> - 2x = 6......=> x = - 3

- 2x + 1 = - 7....=> - 2x = - 7 - 1.=> - 2x = - 8.....=> x = 4

Resposta: as raízes são -3....e....4

S = {- 3, 4}