Question

9x elevado 2 - 4x = 0

Answer 1

$\frac{4}{9}$

Answer 2

a = 9
b = -4
c = 0

Δ= (-4)² -4.9.0
Δ = 16 -36.0
Δ = 16

x= -(-4) +- √16/2.9
x= 4 +- 4/18
x'= 4+4/18
x' = 8/18 (Simplifica por 2) 
x' = 4/9

x"= 4-4/18
x"= 0/18 
x"= 0