Question

raizes da equacao 7x²-21=0

Answer 1

 7x² - 21 = 0
7x² = 21
x² = 21/7
x² = 3
x = √3
x = + 3 e x = - 3

R.: x = + 3 e x = - 3

Answer 2

7x^2 - 21 = 0 7x^2 = 21 x^2 = 21/7 x^2 = 3 x = +-√3 S = {√3,-√3}