Let f(x) is a polynomial such that f(f(x)) –x2 =xf(x),then what is the value of f(-91)?

1. 90

2. -92

3. 0

4. Cannot be determined

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  1. Sir
    I suppose it should be 90 instead of -92 as if we substitue value of x= -91 in the equation f(x)= -(x+1), we get f(-91) = 90

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