Question

x³-16x=0

Answer 1

\(x^3-16x=0\)

\(\left(x^2-16\right)x=0\)

Th1: \(x=0\)

Th2: \(x^2-16=0\)

       \(x^2=16\)

       \(x=+-4\)

Vậy x=-4; 0; 4 

Answer 2

\(x^3-16x=0\)

\(=>x\left(x^2-16\right)=0\)

\(=>\orbr{\begin{cases}x=0\\x^2-16=0\end{cases}}\)

\(=>\orbr{\begin{cases}x=0\\x=+-4\end{cases}}\)

Answer 3

x³-16x=0

=>x².x-16x=0

=>x².x=16x

=>x²=16

=>x²=4²

=>x=4

Answer 4

Dễ mà x=0,4,-4