WAEC 2021 Mathematics · Question 26
Solve: 2 = 32
Options
- A.13
- B.24
- C.12
- D.11
Answer: C. 12
Explanation written with AI and checked against the answer key
Analyze the question: We need to find x such that 2 raised to the power √(2x + 1) equals 32.
Concept: If the bases are the same, the exponents must be equal. So write 32 as a power of 2.
Solution:
- Write 32 as a power of 2: 32 = 2⁵
- Equate the exponents: √(2x + 1) = 5
- Square both sides: 2x + 1 = 25
- Solve: 2x = 24, so x = 12
Check: If x = 12, then 2x + 1 = 25, √25 = 5, and 2⁵ = 32. ✓
Answer: x = 12, which is option C.
Tip: For exponential equations, always rewrite both sides with the same base first (2, 3, 5 and their powers come up often). Memorize powers of 2 up to 2¹⁰: 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024. When a square root appears, square both sides, then check your answer in the original equation.
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