How many real solutions does have?
Answer and explanation
Correct answer: D.
- Step 1: Case : gives , which is not , so it is rejected.
- Step 2: Case : gives , which is and gives , so it is valid.
- Step 3: There is exactly solution.
Answer
.
Why not the others: gives but , so it fails. The only solution is , where , so , , and are wrong.
Practise more Inequalities and modulus.
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