Boa tarde Joao(3x² - 7)! = 1 (3x² - 7)! = 1!3x² - 7 = 13x² = 1 + 7 = 8 x² = 8/3x1 = √(8/3) , x2 = -√(8/3) x1 + x2 = √(8/3) - √(8/3) = 0