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\left(5x^{7}y^{5}\right)^{4}
Use the rules of exponents to simplify the expression.
5^{4}\left(x^{7}\right)^{4}\left(y^{5}\right)^{4}
To raise the product of two or more numbers to a power, raise each number to the power and take their product.
625\left(x^{7}\right)^{4}\left(y^{5}\right)^{4}
Raise 5 to the power 4.
625x^{7\times 4}y^{5\times 4}
To raise a power to another power, multiply the exponents.
625x^{28}y^{5\times 4}
Multiply 7 times 4.
625x^{28}y^{20}
Multiply 5 times 4.
\left(5x^{7}y^{5}\right)^{4}
Use the rules of exponents to simplify the expression.
5^{4}\left(x^{7}\right)^{4}\left(y^{5}\right)^{4}
To raise the product of two or more numbers to a power, raise each number to the power and take their product.
625\left(x^{7}\right)^{4}\left(y^{5}\right)^{4}
Raise 5 to the power 4.
625x^{7\times 4}y^{5\times 4}
To raise a power to another power, multiply the exponents.
625x^{28}y^{5\times 4}
Multiply 7 times 4.
625x^{28}y^{20}
Multiply 5 times 4.