Question

3x elevado a 2 - 12x=0​

Answer 1

3x ² - 12x =0

3. (x ² - 4x) = 0

x ² - 4x = 0

x.(x-4) = 0

x = 0

ou

x-4=0 ⇒ x = 4

S = {0,4}

Answer 2

3x² - 12x = 0

a= 3

b= -12

c = 0

∆ = b² - 4.a.c

∆ = (-12)² - 4 . 3 . 0

∆ = 144

- b +- √∆ / 2.a

- (-12) +- √144 / 2.3

12 +- 12 / 6

x'= 12 + 12 / 6 = 24/6 = 24/6 = 4

x"= 12-12/6 = 0