Algebra · real student question

Divide 4p minus 2 plus 3p squared by p minus 1.

Question

Divide 4p2+3p2p1\dfrac{4p-2+3p^2}{p-1}.

Step-by-step solution

  1. Put the numerator in descending order first. 4p2+3p24p-2+3p^2 becomes 3p2+4p23p^2+4p-2. Synthetic division reads coefficients strictly from the highest power down, so an out-of-order polynomial must be rewritten before anything else.

  2. Set up with the root p = 1. The divisor p1p-1 vanishes at p=1p=1, and the coefficient list is 3, 4, 23,\ 4,\ -2.

  3. Run the division. Bring down 33; 3×1=33\times1=3 and 4+3=74+3=7; 7×1=77\times1=7 and 2+7=5-2+7=5. The bottom row is 3, 7, 53,\ 7,\ 5.

  4. Interpret the row. The first two entries are the quotient 3p+73p+7 (one degree lower than the numerator), and the last entry 55 is the remainder: 3p2+4p2p1=3p+7+5p1.\frac{3p^2+4p-2}{p-1} = 3p+7+\frac{5}{p-1}.

  5. Confirm the remainder with the remainder theorem. Evaluating the numerator at p=1p=1: 3(1)+4(1)2=53(1)+4(1)-2 = 5, which matches the remainder exactly - an independent check that costs one substitution.

  6. Verify the whole identity. (p1)(3p+7)+5=3p2+7p3p7+5=3p2+4p2(p-1)(3p+7)+5 = 3p^2+7p-3p-7+5 = 3p^2+4p-2, the original numerator.

Answer

3p+7+5p13p+7+\frac{5}{p-1}

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