The model shows the expression 21+9
which expression is equivalent for this sum​

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What is x3+3x2−16x−48 divided by x−1?

[15 points]find the quotient with the restrictions. (x^2 - 2x - 3) (x^2 + 4x + 3) ÷ (x^2 + 2x - 8) (x^2 + 6x + 8)