\[2x\times 3x\]

1
Take out the constants.
(2×3)xx(2\times 3)xx

2
Simplify  2×32\times 3  to  66.
6xx6xx

3
Use Product Rule: xaxb=xa+b{x}^{a}{x}^{b}={x}^{a+b}.
6x26{x}^{2}

Done

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