Divide $$$x^{2}$$$ by $$$x + 1$$$
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Find $$$\frac{x^{2}}{x + 1}$$$ using long division.
Solution
Write the problem in the special format (missed terms are written with zero coefficients):
$$$\begin{array}{r|r}\hline\\x+1&x^{2}+0 x+0\end{array}$$$
Step 1
Divide the leading term of the dividend by the leading term of the divisor: $$$\frac{x^{2}}{x} = x$$$.
Write down the calculated result in the upper part of the table.
Multiply it by the divisor: $$$x \left(x+1\right) = x^{2}+x$$$.
Subtract the dividend from the obtained result: $$$\left(x^{2}\right) - \left(x^{2}+x\right) = - x$$$.
$$\begin{array}{r|rrr:c}&{\color{Green}x}&&&\\\hline\\{\color{Magenta}x}+1&{\color{Green}x^{2}}&+0 x&+0&\frac{{\color{Green}x^{2}}}{{\color{Magenta}x}} = {\color{Green}x}\\&-\phantom{x^{2}}&&&\\&x^{2}&+x&&{\color{Green}x} \left(x+1\right) = x^{2}+x\\\hline\\&&- x&+0&\end{array}$$Step 2
Divide the leading term of the obtained remainder by the leading term of the divisor: $$$\frac{- x}{x} = -1$$$.
Write down the calculated result in the upper part of the table.
Multiply it by the divisor: $$$- \left(x+1\right) = - x-1$$$.
Subtract the remainder from the obtained result: $$$\left(- x\right) - \left(- x-1\right) = 1$$$.
$$\begin{array}{r|rrr:c}&x&{\color{Blue}-1}&&\\\hline\\{\color{Magenta}x}+1&x^{2}&+0 x&+0&\\&-\phantom{x^{2}}&&&\\&x^{2}&+x&&\\\hline\\&&{\color{Blue}- x}&+0&\frac{{\color{Blue}- x}}{{\color{Magenta}x}} = {\color{Blue}-1}\\&&-\phantom{- x}&&\\&&- x&-1&{\color{Blue}-1} \left(x+1\right) = - x-1\\\hline\\&&&1&\end{array}$$Since the degree of the remainder is less than the degree of the divisor, we are done.
The resulting table is shown once more:
$$\begin{array}{r|rrr:c}&{\color{Green}x}&{\color{Blue}-1}&&\text{Hints}\\\hline\\{\color{Magenta}x}+1&{\color{Green}x^{2}}&+0 x&+0&\frac{{\color{Green}x^{2}}}{{\color{Magenta}x}} = {\color{Green}x}\\&-\phantom{x^{2}}&&&\\&x^{2}&+x&&{\color{Green}x} \left(x+1\right) = x^{2}+x\\\hline\\&&{\color{Blue}- x}&+0&\frac{{\color{Blue}- x}}{{\color{Magenta}x}} = {\color{Blue}-1}\\&&-\phantom{- x}&&\\&&- x&-1&{\color{Blue}-1} \left(x+1\right) = - x-1\\\hline\\&&&1&\end{array}$$Therefore, $$$\frac{x^{2}}{x + 1} = \left(x - 1\right) + \frac{1}{x + 1}$$$.
Answer
$$$\frac{x^{2}}{x + 1} = \left(x - 1\right) + \frac{1}{x + 1}$$$A