Question

-x²+6x+9=0 alquem pra responder pfv?

Answer 1

-(-1) -x² + 6x + 9 = 0 
x² + 6x + 9 = 0
a = 1
b = 6
c = 9

Δ = -b² - 4ac
Δ = -(-6)² - 4.1.9
Δ = 36 - 36
Δ = 0 
  Quando Δ = 0;
x = -b/2a
x = + 6/2
x = +/- √3
S = {-3,3} 
Espero ter ajudado