Q. Divide the polynomials.The form of your answer should either be p(x) or p(x)+x+3k where p(x) is a polynomial and k is an integer.x+32x3−x2−12=
Set up long division: Set up the long division.We will use polynomial long division to divide (2x3−x2−12) by (x+3).
Divide first term: Divide the first term of the dividend by the first term of the divisor.Divide 2x3 by x to get 2x2.Write 2x2 above the division bar.
Multiply divisor and result: Multiply the divisor (x+3) by the result from Step 2(2x2).2x2∗(x+3)=2x3+6x2.
Subtract result from dividend: Subtract the result from Step 3 from the dividend.(2x3−x2−12)−(2x3+6x2)=−7x2−12.Bring down the next term if necessary.
Divide new dividend: Divide the first term of the new dividend (−7x2) by the first term of the divisor (x).Divide −7x2 by x to get −7x.Write −7x above the division bar next to 2x2.
Multiply divisor and result: Multiply the divisor (x+3) by the result from Step 5(−7x).−7x×(x+3)=−7x2−21x.
Subtract result from new dividend: Subtract the result from Step 6 from the new dividend.(−7x2−12)−(−7x2−21x)=21x−12.
Divide new dividend: Divide the first term of the new dividend (21x) by the first term of the divisor (x).Divide 21x by x to get 21.Write 21 above the division bar next to 2x2−7x.
Multiply divisor and result: Multiply the divisor (x+3) by the result from Step 8(21).21×(x+3)=21x+63.
Subtract result from new dividend: Subtract the result from Step 9 from the new dividend.(21x−12)−(21x+63)=−75.
Write the remainder: Write the remainder.Since −75 cannot be divided by x+3, we write it as the remainder in the form of (−75)/(x+3).
Combine quotient and remainder: Combine the quotient and the remainder to express the final answer.The quotient is 2x2−7x+21 and the remainder is x+3−75.The final answer is p(x)+x+3k, where p(x)=2x2−7x+21 and k=−75.
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