Expressions, Equations and Identities Quiz
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5 questions, one answer each
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1. What does the notation 3y represent?
- A. A) y × y × y
- B. B) y + y + y
- C. C) 3 + y
- D. D) y³
2. Which of these is an identity rather than an equation?
- A. A) 2x + 1 = 7
- B. B) x² − 1 ≡ (x − 1)(x + 1)
- C. C) A = πr²
- D. D) 3x + 2
3. Simplify 5x + 3y − 2x + y.
- A. A) 3x + 4y
- B. B) 7x + 4y
- C. C) 3x + 2y
- D. D) 8x + 4y
4. If a = 4 and b = −2, what is the value of a² + 3b?
- A. A) 10
- B. B) 22
- C. C) −2
- D. D) 4
5. Which statement correctly proves that 2(x+3) + x ≡ 3x + 6?
- A. A) Substitute x = 1 on both sides and check they are equal
- B. B) Expand and simplify the left side to get 3x + 6, matching the right side exactly
- C. C) Solve for x
- D. D) Rearrange to make x the subject