Lesson Example Discussion Quiz: Class Homework |
Step-4 |
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 \$2x^4 + 6x^3 - x^2 - 3x + 6\$ by the binomial (x + 3). |
|
2 |
Step |
The given polynomial is |
\$2x^4 + 6x^3 - x^2 - 3x + 6\$ (x + 3) |
3 |
Step |
First, we’ll set up the synthetic division: |
\$-3 | 2 6 - 1 - 3 6\$ |
4 |
Step |
Now, let’s perform the synthetic division: + 1. Bring down the leading coefficient, which is |
2 |
5 |
Step |
2.Multiply the divisor, -3, by the result from step 1, which gives us |
-6 |
6 |
Step |
3.Add the coefficient from the polynomial in the first column to the result from step 2. So |
6 + (-6) = 0 |
7 |
Step |
4.Multiply the divisor, -3, by the result from step 3, which gives us |
0 |
8 |
Step |
5.Add the coefficient from the polynomial in the second column to the result from step 4. So |
-1 + 0 = - 1 |
9 |
Step |
6.Multiply the divisor, -3, by the result from step 5, which gives us |
\$ -3 times -1\$ = 3 |
10 |
Step |
7.Add the coefficient from the polynomial in the third column to the result from step 6. So |
-3 + 3 = 0 |
11 |
Step |
8.Multiply the divisor, -3, by the result from step 7, which gives us |
0 |
12 |
Step |
9.Add the coefficient from the polynomial in the fourth column to the result from step 8. So |
6 + 0 = 6 |
13 |
Step |
So, the quotient is \$2x^3 - x -1\$ and the remainder is 6. |
|
14 |
Step |
Therefore, \$2x^4 + 6x^3− x^2−3x+6\$ divided by ( x + 3) equals \$2x^3 − x−1\$ with a remainder of 6. |
|
15 |
Choice.A |
It incorrectly states the quotient as \$2x^3 + x − 1\$, but the correct one, shown in the division, is \$2x^3 − x − 1\$. Hence, option A is wrong |
Quotient is \$2x^3 + x -1\$ and the remainder is 6 |
16 |
Choice.B |
This statement is accurate, as it yields the correct quotient \$2x^3 − x − 1\$ and leaves a remainder of 6 |
Quotient is \$2x^3 - x -1\$ and the remainder is 6 |
17 |
Choice.C |
The quotient obtained through polynomial division \$- 2x^3 - x -1\$ is incorrect |
Quotient is \$- 2x^3 - x -1\$ and the remainder is 6 |
18 |
Choice.D |
Because the sign of the x variable and constant term in the quotient is incorrect |
Quotient is \$- 2x^3 + x +1\$ and the remainder is 6 |
19 |
Answer |
Option |
B |
20 |
Sumup |
Can you summarize what you’ve understood in the above steps? |
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