Question 1
Question detail
reasoning check: solve 2x + 7 = 21.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Notation, vocabulary and manipulation
Question
- A. x = 7
- B. 2x
- C. 1x^2
- D. 1x
Answer
The correct answer is x = 7.
Explanation
Trace the calculation before choosing. The verified method for Identities and algebraic proof gives x = 7; no later explanation is allowed to change that value.
Common mistake
Identities and algebraic proof common mistake 1
Writing a final answer without showing the method that justifies it. This can weaken answers for: [Foundation and Higher] Know the difference between an equation and an identity..
Show the method first, then give the final answer in the required form. Apply this directly to Identities and algebraic proof.
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