Let the functions f:R→R and be defined as f(x)=x^2. Then f^−1(−9) = will be?
- Ø
- -3
- 3
- None of these
Explanation
Since f(x) = x^2 is always non-negative, there is no real x such that f(x) = -9.
So, the inverse image of -9 is the empty set:
f^(-1)(-9) = Ø
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