Simplify: 21y^5-42y^4+49y^3 over 7y^3

Simplify: 21y^5-42y^4+49y^3 over 7y^3

7^3x * 7 * 7^x-1

Answers: 1. 4a^2-a+6 2. 4a^2-a+4 3. 4a^2+7a+6 4. 4a^2+7a+4

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