Question

como resolvo x²-9=0 pela formula de baskara??

Answer 1

Δ = 9² - 0
Δ = 81

x = 9 +- √81/2
x = 9 +-9/2

x' = 9 + 9/2
x' = 18/2 = 9

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