Lesson Example Discussion Quiz: Class Homework |
Step-1 |
Title: Evaluating Algebric Expressions |
Grade: 6-b Lesson: S2-L5 |
Explanation: Hello Students, time to practice and review the steps for the problem. |
Lesson Steps
| Step | Type | Explanation | Answer |
|---|---|---|---|
1 |
Problem |
Evaluate the expression (2x + 3)(x - 1) when x = 3. |
|
2 |
Step |
The Given expression is |
(2x + 3)(x - 1) |
3 |
Step |
Substitute 3 in place of x in given expression |
\$(2 times 3 + 3) (3 − 1)\$ |
4 |
Step |
Simplify the equation |
\$(6 + 3) times 2\$ ⇒ \$9 times 2\$ ⇒ (18) |
5 |
Step |
Therefore, when x = 3, the value of the expression (2x + 3)(x − 1) is 18. |
|
6 |
Choice.A |
The expression yields 18, not 20, indicating an error in the calculation process |
20 |
7 |
Choice.B |
The expression’s calculated value is 18, not 23, rendering it incorrect |
23 |
8 |
Choice.C |
The expression’s calculated value is 18, not 29, thus indicating an incorrect evaluation |
29 |
9 |
Choice.D |
The correctness lies in the expression yielding 18 through accurate calculation |
18 |
10 |
Answer |
Option |
D |
11 |
Sumup |
Can you summarize what you’ve understood in the above steps? |
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