Sets,Relation and Function

If f : R ---->R defined by f(x) = x2 + 1, then values of f -1 (17) and f -1(-3) are A. {Ø}, (4, - 4) B. {3,-3},{Ø} C. {Ø},{3,-3} D. {4,-4},Ø Answer is "D". But i dint understand how
If f : R ---->R defined by f(x) = x2 + 1, then values of f -1 (17) and f -1(-3) are A. {Ø}, (4, - 4) B. {3,-3},{Ø} C. {Ø},{3,-3} D. {4,-4},Ø Answer is "D". But i dint understand how

answered
Jul 24, 2017
in CBSE/UGC NET
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