Question

resolva as equacoes do 2° grau sendo U E R

x2-49=0
x2=1

Answer 1

a) x² - 49 = 0
 ⇒x² = 0 + 49
 ⇒x² = 49
 ⇒ x = +/-√49
 ⇒ x = +/- 7

S = {-7,7}

b) x² = 1
 ⇒x = +/-√1
 ⇒x = +/- 1

S = {-1,1}