Question

e) 4x² – 12x=0
f) 5x2 + x = 0

Answer 1

Vamos lá :

e)

4x² - 12x = 0   : ( - 4)

x² - 3x = 0

x(x - 3) = 0

x₁ = 0

x - 3 = 0

x₂ = 3

f)

5x² + x = 0

x(5x + 1) = 0

x₁ = 0

5x + 1 = 0

5x = - 1

x₂ = - 1/5

Espero ter ajudado!!!