Question

X elevado a 2 + 9x + 8 = 0

Answer 1

x² + 9x + 8 = 0

a = 1; b = 9; c = 8

x = [- b ± √(b² - 4ac)] / 2a
x = [- 9 ± √(9² - 4 · 1 · 8)] / 2 · 1
x = [- 9 ± √(81 - 32)] / 2
x = [- 9 ± √49] / 2
x = [- 9 ± 7] / 2
x' = [- 9 + 7] / 2 = -2 / 2 = -1
x'' = [- 9 - 7] / 2 = -16 / 2 = -8

Espero ter ajudado. Valeu!