use synthetic division to solve $(x^{3}+1)div(x - 1)$. what is the quotient?\n$x^{2}+x + 1+\frac{2}{x +…

use synthetic division to solve $(x^{3}+1)div(x - 1)$. what is the quotient?\n$x^{2}+x + 1+\frac{2}{x + 1}$\n$x^{2}-x + 1$\n$x^{2}+x + 1+\frac{2}{x - 1}$\n$x^{3}-x^{2}+x$
Answer
Explanation:
Step1: Set up synthetic division
The divisor is $x - 1$, so we use $c = 1$. The dividend is $x^{3}+0x^{2}+0x + 1$, and we set up the synthetic - division as follows:
| 1 | 1 | 0 | 0 | 1 |
|---|---|---|---|---|
Step2: Bring down the first coefficient
Bring down the first coefficient 1:
| 1 | 1 | 0 | 0 | 1 |
|---|---|---|---|---|
| 1 |
Step3: Multiply and add
Multiply 1 (the number we brought down) by 1 (the value of $c$) to get 1, and add to the next coefficient 0: $0 + 1=1$.
| 1 | 1 | 0 | 0 | 1 |
|---|---|---|---|---|
| 1 | ||||
| 1 | 1 |
Multiply 1 by 1 again to get 1, and add to the next coefficient 0: $0 + 1 = 1$.
| 1 | 1 | 0 | 0 | 1 |
|---|---|---|---|---|
| 1 | 1 | |||
| 1 | 1 | 1 |
Multiply 1 by 1 one more time to get 1, and add to the last coefficient 1: $1+1 = 2$.
| 1 | 1 | 0 | 0 | 1 |
|---|---|---|---|---|
| 1 | 1 | 1 | ||
| 1 | 1 | 1 | 2 |
The numbers 1, 1, 1 are the coefficients of the quotient polynomial, and 2 is the remainder. The quotient is $x^{2}+x + 1$ and the remainder is 2. So, $\frac{x^{3}+1}{x - 1}=x^{2}+x + 1+\frac{2}{x - 1}$.
Answer:
$x^{2}+x + 1+\frac{2}{x - 1}$