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Divide 3x3 - 5x2 + 3 by x-3 using synthetic division.

Mathematics

ScanSolve AI Answer

Answer

3x2+4x+123x^2 + 4x + 12

39

Step-by-step solution

3 steps

To use synthetic division for 3x3−5x2+33x^3 - 5x^2 + 3 divided by (x−3)(x-3):

  1. Set up the synthetic division.

    The divisor is (x−3)(x-3), so we use 3 for the division.
    The coefficients of the polynomial 3x3−5x2+0x+33x^3 - 5x^2 + 0x + 3 are 3,−5,0,33, -5, 0, 3. (Note: A 0 is used for the missing xx term).

    33−503\begin{array}{c|cccc} 3 & 3 & -5 & 0 & 3 \\ & & & & \\ \hline & & & & \end{array}
  2. Perform the synthetic division.

    Bring down the first coefficient (3).
    Multiply 3×3=93 \times 3 = 9. Add to −5-5: −5+9=4-5 + 9 = 4.
    Multiply 4×3=124 \times 3 = 12. Add to 0: 0+12=120 + 12 = 12.
    Multiply 12×3=3612 \times 3 = 36. Add to 3: 3+36=393 + 36 = 39.

    33−50391236341239\begin{array}{c|cccc} 3 & 3 & -5 & 0 & 3 \\ & & 9 & 12 & 36 \\ \hline & 3 & 4 & 12 & 39 \end{array}
  3. Identify the quotient and the remainder.

    The numbers in the bottom row, excluding the last one, are the coefficients of the quotient. Since the original polynomial was degree 3, the quotient will be degree 2.
    The last number is the remainder.

    The coefficients of the quotient are 3,4,123, 4, 12.
    The quotient is 3x2+4x+123x^2 + 4x + 12.
    The remainder is 39.

    The quotient is 3x2+4x+12\boxed{3x^2 + 4x + 12}
    The remainder is 39\boxed{39}

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