0.1×x×0.1×x×0.10.1\times x\times 0.1\times x\times 0.1

1
Take out the constants.
(0.1×0.1×0.1)xx(0.1\times 0.1\times 0.1)xx

2
Simplify  0.1×0.10.1\times 0.1  to  0.010.01.
(0.01×0.1)xx(0.01\times 0.1)xx

3
Simplify  0.01×0.10.01\times 0.1  to  0.0010.001.
0.001xx0.001xx

4
Use Product Rule: xaxb=xa+b{x}^{a}{x}^{b}={x}^{a+b}.
0.001x20.001{x}^{2}

Done

How can we make this solution more helpful?