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Algebra · real student question

Divide negative 5p plus 4p squared plus 4 by p minus 2.

Question

Divide −5p+4p2+4p−2\dfrac{-5p+4p^2+4}{p-2}.

Step-by-step solution

  1. Reorder the numerator. −5p+4p2+4=4p2−5p+4-5p+4p^2+4 = 4p^2-5p+4, so the coefficients in descending order are 4, −5, 44,\ -5,\ 4. Scrambled term order is deliberate in these exercises - sorting first is non-negotiable.

  2. Identify the root. p−2=0p-2=0 gives p=2p=2.

  3. Divide synthetically. Bring down 44; 4×2=84\times2=8 and −5+8=3-5+8=3; 3×2=63\times2=6 and 4+6=104+6=10. The bottom row is 4, 3, 104,\ 3,\ 10.

  4. Read the quotient and remainder. 4p2−5p+4p−2=4p+3+10p−2.\frac{4p^2-5p+4}{p-2} = 4p+3+\frac{10}{p-2}. A nonzero remainder means p−2p-2 is not a factor of the numerator.

  5. Cross-check with the remainder theorem. The numerator at p=2p=2 is 4(4)−5(2)+4=16−10+4=104(4)-5(2)+4 = 16-10+4 = 10, matching the remainder.

  6. Verify the identity. (p−2)(4p+3)+10=4p2+3p−8p−6+10=4p2−5p+4(p-2)(4p+3)+10 = 4p^2+3p-8p-6+10 = 4p^2-5p+4, which is the original numerator.

Answer

4p+3+10p−24p+3+\frac{10}{p-2}

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