Question

x²-11x+28=0 me ajudem aí ​

Answer 1

x² - 11x + 28 = 0

x² - 11x = - 28

x² - 11x + 121/4 = - 28 + 121/4

(x - 11/2)² = 9/4

x - 11/2 = ± 3/2

x = 11/2 ± 3/2

x1 = (11 + 3)/2

x1 = 14/2

x1 = 7

x2 = (11 - 3)/2

x2 = 8/2

x2 = 4

Resposta: x = 7 ou x = 4