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11 June, 17:22

When f (x) = 2x^2+3, find f (-3).

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  1. 11 June, 18:58
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    f (-3) = 21

    Step-by-step explanation:

    We "evaluate" the function f (x) = 2x^2+3 at x = - 3 by subbing - 3 for x in f (x) = 2x^2+3:

    f (-3) = 2 (-3) ^2 + 3 = 2 (9) + 3 = 21.

    Thus, f (-3) = 21
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