Question

Solve 3x2 = 12x.

x = 0, x = 4

x = 0, x = −4

x = 3, x = 4

x = 3, x = −4

Answer 1

Divide both sides by 3.

\(\Large \color{Black}{\Rightarrow x^2 = 4x }\)

Set up a quadratic equation.

\(\Large \color{Black}{\Rightarrow x^2 - 4x = 0 }\)

Factor.

\(\Large \color{Black}{\Rightarrow x(x - 4) = 0}\)

Either x = 0 -OR- x - 4 = 0
x = 4
OR
x = 0

Answer 2

x= (4,0)