數學:求有多少個實根
回答 (2)
2010-04-18 4:53 am
✔ 最佳答案
2^x + x^2 - 4 = 02^x = 4 - x^2
So the solutions to the equation is the interesecting point of the exponential function y = 2^x and the quadratic function y = 4 - x^2. By sketching the 2 graphs, we can see 2 intersecting points, so 2 real roots.
2010-04-18 5:08 am
收錄日期: 2021-04-23 23:25:51
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https://hk.answers.yahoo.com/question/index?qid=20100417000051KK01306