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How Long Division Works

Part of the Polynomials & Rational Expressions section of Coddy's Algebra 2 journey. Lesson 1 of 51.

97 divided by 4 is 24, remainder 1. Polynomials, sums of powers of x, divide step by step in the same way. Divide x2+3x+5{x}^{2}+3x+5 by x+1x+1.

  • x2{x}^{2} divided by x is x. Subtract x(x+1)x\left(x+1\right). Left: 2x+52x+5.
  • 2x divided by x is 2. Subtract 2(x+1)2\left(x+1\right). Left: 3.
  • 3 has no x, so stop. Answer: x+2+3x+1x+2+\frac{3}{x+1}.
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Challenge

Divide x2+5x+9{x}^{2}+5x+9 by x+2x+2. Write one step per line: the answer so far, plus what is left divided by x+2x+2. Stop when what is left has no x.

Try it yourself

x2+5x+9x+2\frac{x^{2}+5x+9}{x+2}

Divide the polynomials

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