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\left(3xy^{2}\right)^{2}+\left(-x\right)y^{4}\times 4x
To multiply powers of the same base, add their exponents. Add 3 and 1 to get 4.
3^{2}x^{2}\left(y^{2}\right)^{2}+\left(-x\right)y^{4}\times 4x
Expand \left(3xy^{2}\right)^{2}.
3^{2}x^{2}y^{4}+\left(-x\right)y^{4}\times 4x
To raise a power to another power, multiply the exponents. Multiply 2 and 2 to get 4.
9x^{2}y^{4}+\left(-x\right)y^{4}\times 4x
Calculate 3 to the power of 2 and get 9.
9x^{2}y^{4}-x^{2}y^{4}\times 4
Multiply x and x to get x^{2}.
9x^{2}y^{4}-4x^{2}y^{4}
Multiply -1 and 4 to get -4.
5x^{2}y^{4}
Combine 9x^{2}y^{4} and -4x^{2}y^{4} to get 5x^{2}y^{4}.
\left(3xy^{2}\right)^{2}+\left(-x\right)y^{4}\times 4x
To multiply powers of the same base, add their exponents. Add 3 and 1 to get 4.
3^{2}x^{2}\left(y^{2}\right)^{2}+\left(-x\right)y^{4}\times 4x
Expand \left(3xy^{2}\right)^{2}.
3^{2}x^{2}y^{4}+\left(-x\right)y^{4}\times 4x
To raise a power to another power, multiply the exponents. Multiply 2 and 2 to get 4.
9x^{2}y^{4}+\left(-x\right)y^{4}\times 4x
Calculate 3 to the power of 2 and get 9.
9x^{2}y^{4}-x^{2}y^{4}\times 4
Multiply x and x to get x^{2}.
9x^{2}y^{4}-4x^{2}y^{4}
Multiply -1 and 4 to get -4.
5x^{2}y^{4}
Combine 9x^{2}y^{4} and -4x^{2}y^{4} to get 5x^{2}y^{4}.