Maths : how to do, thanks?
回答 (1)
2019-04-29 8:38 pm
✔ 最佳答案
"The vertex of the graph y=f(x) is V(3,y)" implies a few things:1. f(x) is quadratic, k not zero; 2. f(x)=k(x-3)^2+b, when completed perfect square; 3. f'(3)=0. Either 2. or 3. leads to k=2 and so y=f(3)=-16.
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https://hk.answers.yahoo.com/question/index?qid=20190428035835AAIaTBJ