Question

quanto e x elevado a 2 -9

Answer 1

x² - 9 = 0

x² = 9

x = + ou - √9

x' = 3

x'' = -3

S = {-3, 3}

Answer 2

x² - 9x + 0 = 0

a = 1

b = 9

c = 0

Δ = b² - 4ac

Δ = 9² - 4*1*0

Δ = 81

X = -b +/- √Δ / 2a

X = -9 +/- 9 / 2

x' = -9 + 9 = 0 / 2 = 0

x'' = -9 -9 = -18 / 2 = -9

Espero ter ajudado :v