Question

3X ao quadrado menos 12 x igual a zero

Answer 1

3x^2-12x=0
delta=b^2-4ac
delta=(-12)^2-4.3.0
delta=144-0
delta=144
x=-b-/+ raiz de delta/2a
x=-(-12)-12/2.3
x=12-12/6
x=0/6
x=0
x=-(-12)+12/2.3
x=12+12/6
x=24/6
x=4

Answer 2

$3 x^{2} -12x=0\to\ Por~Evid\^encia:\\\\\\ x(3x-12)=0\\\\\\ x=0\\\\ 3x-12=0\to 3x=12\to x= \frac{12}{3} \to x=4\\\\\\\\ S=\{0;4\}$