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An Intiative by Sri Chaitanya
a
(−∞, 3]
b
(−∞, −3]∪[3, ∞)
c
(−∞, −1]∪[1, ∞)
d
[−1, 1]
answer is C.
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Detailed Solution
The given function is f(x)=x2+3x-4 The above function is defined only when the expression under the root must be non negativex2+3|x|−4≥0 factorize ⇒(|x|+4)(|x|−1)≥0 |x|≤−4 or |x|≥1 x∈(−∞, −1]∪[1, ∞)