Ответ:
2) (7+x)(2−x)≤0
x+7≥0
2−x≤0
х≥2
2−x≥0
x+7≤0
x≤−7
x≥2; x≤−7
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Ответ:
2) (7+x)(2−x)≤0
x+7≥0
2−x≤0
х≥2
2−x≥0
x+7≤0
x≤−7
x≥2; x≤−7