The graph of f(x)=a*x^b+2 passes through P(1|1) and Q(2|-2) . Find f(x). 高三党看不懂,求解答过程.

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The graph of f(x)=a*x^b+2 passes through P(1|1) and Q(2|-2) . Find f(x). 高三党看不懂,求解答过程.

The graph of f(x)=a*x^b+2 passes through P(1|1) and Q(2|-2) . Find f(x). 高三党看不懂,求解答过程.
The graph of f(x)=a*x^b+2 passes through P(1|1) and Q(2|-2) . Find f(x). 高三党看不懂,求解答过程.

The graph of f(x)=a*x^b+2 passes through P(1|1) and Q(2|-2) . Find f(x). 高三党看不懂,求解答过程.
这是个貌似是初中的题吧,只不过题干是英文的.就是告诉了2个点,求f(x)
由题意-2=a*2^b+2 1=a+2 解得a=-1,b=2 f(x)=-x^2+2

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