Lesson Example Discussion Quiz: Class Homework |
Step-2 |
Title: Synthetic division |
Grade: 8-a Lesson: S1-L4 |
Explanation: Hello Students, time to practice and review the steps for the problem. |
Lesson Steps
Step | Type | Explanation | Answer |
---|---|---|---|
1 |
Problem |
Divide the polynomial \$ 3x^3 - 7x^2 + 6x - 4\$ by the binomial \$(x - 2)\$. |
|
2 |
Step |
The given polynomials are |
\$ 3x^3 - 7x^2 + 6x - 4\$ |
3 |
Step |
Identify the root of the divisor x − 2 |
x - 2 = 0 |
4 |
Step |
Write down the coefficients of the terms of the dividend polynomial \$3x^3 - 7x^2 + 6x - 4\$ in descending order, including any missing terms with coefficient 0 |
3, -7, 6, -4 |
5 |
Step |
Set up the synthetic division, placing the root (in this case, 2) outside the division box, and write down the coefficients inside the box. |
|
6 |
Step |
Bring down the first coefficient (3) to the bottom row of the synthetic division setup |
|
7 |
Step |
Multiply the root (2) by the number at the bottom of the synthetic division setup (3), and write the result (6) below the next coefficient (-7). |
|
8 |
Step |
Repeat these steps until all coefficients have been processed. The numbers in the bottom row represent the coefficients of the quotient polynomial, and the last number is the remainder. |
|
9 |
Step |
So, the result of dividing \$ 3x^3 - 7x^2 + 6x - 4\$ by \$(x - 2)\$ is \$ 3x^2 - x + 4 \$. |
|
10 |
Choice.A |
This option seems incorrect because the sign of the remainder doesn’t match our calculation, which yielded a positive remainder of 4 |
Quotient: \$3x^2 + x - 4\$ with Remainder: -2 |
11 |
Choice.B |
This option matches our calculation. The quotient has the correct coefficients for \$x^2\$ and x, and the remainder matches our result |
Quotient: \$3x^2 - x + 4\$ with Remainder: 4 |
12 |
Choice.C |
This option suggests that the remainder is 0, which contradicts our calculation of a remainder of 4. Additionally, the quotient doesn’t match our calculated quotient \$3x^2 + x − 2\$ |
Quotient: \$3x^2 - 1 \$ with Remainder: 0 |
13 |
Choice.D |
This option’s remainder is incorrect; our calculation yielded a positive remainder of 4 |
Quotient: \$3x^2 - x + 4\$ with Remainder: -4 |
14 |
Answer |
Option |
A |
15 |
Sumup |
Can you summarize what you’ve understood in the above steps? |
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