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Question

What is the range of 2x2+4x7

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Solution

Assuming that the domain of the given function is the set of all real numbers R, so that the variable x takes all values in the interval
(,+)
If x takes all values in the interval (,+) then 4 x + 5 takes all values in the interval (,+) and the range of the given function is given by the interval (,+)

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