1. State the problem. Simplify the expression $2x2x$. 2. Interpret the notation. We interpret $2x2x$ as the product $2\times x\times 2\times x$. 3. Group like factors. Group the numerical factors and the variable factors: $2\times 2\times x\times x$. 4. Multiply and simplify. Compute $2\times 2=4$ and $x\times x=x^2$ so the product is $4x^2$. 5. Final answer. Therefore the simplified result is $4x^2$.