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\$
\$(x - 2)\$

3

Step

Identify the root of the divisor x − 2

x - 2 = 0
x = 2

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

2

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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