Question

como resolver 9x²-4x=0

Answer 1

x ( 9x - 4 ) = 0 
x = 0 
9x - 4 = 0 
9x = 4 
x = 4/9

S= {4,9 e 0} 

Answer 2

9x² - 4x = 0
x . (9x - 4) = 0
x = 0
9x - 4 = 0
9x = 4
x = 4/9