1.

If the points (–2, 1) and (–1, – 2) are on the opposite sides of the line 2x + y + a = 0, then the set of values of a is _________.

Answer» If the points (–2, 1) and (–1, – 2) are on the opposite sides of the line 2x + y + a = 0, then the set of values of a is _________.


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