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...work. So if you wanted , you would know that it would lie between = 7 and = 8, and you would expect an answer of seven point something. (It is 7.416 …). Technically, −7 is also a square root of 49, since (−7)2 = 49. This is called the negative square root. The sign √ is customarily used to denote the positive square root, so = 7 and − = −7. In Example 3, only...

...work by slowing the growth of rapidly dividing cancer cells. Chemotherapy is used to treat cancer (both cure or prevent recurrence) and ease cancer symptoms (used to shrink tumours that might be causing pain). However, some forms of chemotherapy can damage other healthy tissues that also divide rapidly. For example, it can kill the white blood cells that are an essential...