Question

X elevado a 2 - 7x - 8=0

Answer 1

Resposta:

x = -1 e 8.

Explicação passo a passo:

x² - 7x - 8 = 0

x = (-b ± √(b² - 4 • a • c)) / (2 • a)

x = (-(-7) ± √((-7)² - 4 • 1 • (-8))) / (2 • 1)

x = (7 ± √(49 - (-32))) / 2

x = (7 ± √(49 + 32)) / 2

x = (7 ± √81) / 2

x = (7 ± 9) / 2

x1 = (7 + 9) / 2

x1 = 16 / 2

x1 = 8

x2 = (7 - 9) / 2

x2 = -2 / 2

x2 = -1