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-\left(-2x^{2}y\right)^{2}-2x^{4}yy
To multiply powers of the same base, add their exponents. Add 1 and 3 to get 4.
-\left(-2x^{2}y\right)^{2}-2x^{4}y^{2}
Multiply y and y to get y^{2}.
-\left(-2\right)^{2}\left(x^{2}\right)^{2}y^{2}-2x^{4}y^{2}
Expand \left(-2x^{2}y\right)^{2}.
-\left(-2\right)^{2}x^{4}y^{2}-2x^{4}y^{2}
To raise a power to another power, multiply the exponents. Multiply 2 and 2 to get 4.
-4x^{4}y^{2}-2x^{4}y^{2}
Calculate -2 to the power of 2 and get 4.
-6x^{4}y^{2}
Combine -4x^{4}y^{2} and -2x^{4}y^{2} to get -6x^{4}y^{2}.
-\left(-2x^{2}y\right)^{2}-2x^{4}yy
To multiply powers of the same base, add their exponents. Add 1 and 3 to get 4.
-\left(-2x^{2}y\right)^{2}-2x^{4}y^{2}
Multiply y and y to get y^{2}.
-\left(-2\right)^{2}\left(x^{2}\right)^{2}y^{2}-2x^{4}y^{2}
Expand \left(-2x^{2}y\right)^{2}.
-\left(-2\right)^{2}x^{4}y^{2}-2x^{4}y^{2}
To raise a power to another power, multiply the exponents. Multiply 2 and 2 to get 4.
-4x^{4}y^{2}-2x^{4}y^{2}
Calculate -2 to the power of 2 and get 4.
-6x^{4}y^{2}
Combine -4x^{4}y^{2} and -2x^{4}y^{2} to get -6x^{4}y^{2}.