alleryFunction f(x) = (x-1)/(x+2) on R - {-2}. f is bijection from R - {-2} to R - {?}:
AR
BR - {1}
C{1}
DRandom
Answer & Solution
Correct answer: B. R - {1}
As x → ∞, f(x) → 1 (but never equals 1).
So 1 not in range. Range = R - {1}.
f is bijection from R - {-2} to R - {1}. f⁻¹(y) = (2y+1)/(1-y).
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