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2k\left(-k^{2}\right)+4k^{2}+k^{2}\left(-k^{2}\right)+2k^{3}
Use the distributive property to multiply 2k+k^{2} by -k^{2}+2k.
-2kk^{2}+4k^{2}+k^{2}\left(-1\right)k^{2}+2k^{3}
Multiply 2 and -1 to get -2.
-2k^{3}+4k^{2}+k^{2}\left(-1\right)k^{2}+2k^{3}
To multiply powers of the same base, add their exponents. Add 1 and 2 to get 3.
-2k^{3}+4k^{2}+k^{4}\left(-1\right)+2k^{3}
To multiply powers of the same base, add their exponents. Add 2 and 2 to get 4.
4k^{2}+k^{4}\left(-1\right)
Combine -2k^{3} and 2k^{3} to get 0.
2k\left(-k^{2}\right)+4k^{2}+k^{2}\left(-k^{2}\right)+2k^{3}
Use the distributive property to multiply 2k+k^{2} by -k^{2}+2k.
-2kk^{2}+4k^{2}+k^{2}\left(-1\right)k^{2}+2k^{3}
Multiply 2 and -1 to get -2.
-2k^{3}+4k^{2}+k^{2}\left(-1\right)k^{2}+2k^{3}
To multiply powers of the same base, add their exponents. Add 1 and 2 to get 3.
-2k^{3}+4k^{2}+k^{4}\left(-1\right)+2k^{3}
To multiply powers of the same base, add their exponents. Add 2 and 2 to get 4.
4k^{2}+k^{4}\left(-1\right)
Combine -2k^{3} and 2k^{3} to get 0.