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Find the range of the function.

ƒ (x) = 2x^2 + 7

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  1. 2 July, 11:31
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    1) The minimum value of f (x) is going to be when x=0,

    f (0) = 7, all others positive and negative values give f (x) >7.

    2) Coefficient near x² is positive, so parabola is "up".

    So range is f (x) ≥7, or (7,+∞).
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