Question

15x ao quadrado - 45x = 0

Answer 1

15x² - 45x = 0
15x (x - 3) = 0
15x = 0 ⇒ x = 0
x - 3 = 0 ⇒ x = 3

S = {0, 3}

Espero ter ajudado. Valeu!

Answer 2

15x² - 45x = 0

15x • (x - 3) = 0

x= 0

15x - 45 = 0

15x = 0 + 45

15x= 45

x=45/15

x=3

S= ( 0 , 3)