${\left( {x}^{4} \right)}^{2}+2{x}^{4} \times 8y+{\left( 8y \right)}^{2}$
Simplify the expression by multiplying exponents${x}^{8}+2{x}^{4} \times 8y+{\left( 8y \right)}^{2}$
Calculate the product${x}^{8}+16{x}^{4}y+{\left( 8y \right)}^{2}$
To raise a product to a power, raise each factor to that power${x}^{8}+16{x}^{4}y+64{y}^{2}$