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algebra intermediate
Problem
How many integers, , satisfy ?
Solution
We'll consider two cases.
Case 1: is nonnegative. If is nonnegative, then , so we have . Solving this gives . The only integers for which and is nonnegative are and .
Case 2: is negative. If is negative, then , so the inequality becomes . Multiplying by gives , so , which means . The only integer greater than for which is negative is .
Combining these cases gives us integers that satisfy the inequality.
Case 1: is nonnegative. If is nonnegative, then , so we have . Solving this gives . The only integers for which and is nonnegative are and .
Case 2: is negative. If is negative, then , so the inequality becomes . Multiplying by gives , so , which means . The only integer greater than for which is negative is .
Combining these cases gives us integers that satisfy the inequality.
Final answer
3