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3+6x-4x^{2}
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3+6x-4x^{2}
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6x-2x^{2}+3-2x^{2}
Use the distributive property to multiply 2x by 3-x.
6x-4x^{2}+3
Combine -2x^{2} and -2x^{2} to get -4x^{2}.
6x-2x^{2}+3-2x^{2}
Use the distributive property to multiply 2x by 3-x.
6x-4x^{2}+3
Combine -2x^{2} and -2x^{2} to get -4x^{2}.
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