When raising a product to a power, you raise each factor to that power.
Formula: $(ab)^n = a^n b^n$
Examples:
$(xy)^3 = x^3 y^3$
$(2x)^3 = 2^3 \cdot x^3 = 8x^3$
$(4y)^2 = 4^2 \cdot y^2 = 16y^2$
For three terms: $(abc)^n = a^n b^n c^n$.
Example: $(2xy)^2 = 2^2 \cdot x^2 \cdot y^2 = 4x^2y^2$