Simplify (x^(4/3))(x^(2/3))

$(x^{\frac{4}{3}}) (x^{\frac{2}{3}})$

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$x^{\frac{4}{3} + \frac{2}{3}}$

Combine the numerators over the common denominator.

$x^{\frac{4 + 2}{3}}$

Add $4$ and $2$ .

$x^{\frac{6}{3}}$

Divide $6$ by $3$ .

$x^{2}$