x<2
x≤2
x=2
x>−2
Correct answer is B
f:x→√4−2x defined on the set of real numbers, R, which has range from (−∞,∞) but because of the root sign, it is defined from [0,∞).
This is because the root of numbers only has real number values from 0 and upwards.
√4−2x≥0⟹4−2x≥0
−2x≥−4;x≤2
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