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Question
The solution of (2x – 1)2 = 9 is equal to
Options
– 1
2
– 1, 2
None of these
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Solution
– 1, 2
Explanation;
Hint:
(2x – 1)2 = 9 ⇒ (2x – 1) = `sqrt(9)`
2x – 1 = ± 3 ⇒ 2x – 1 = 3 or 2x – 1 = 3
2x – 1 = 3
2x = 4 ⇒ x = `4/2` = 2
2x – 1 = – 3 ⇒ 2x = – 3 + 1
x = – 1
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