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18 July, 03:39

If f (x) = 3x2 - 2x + 5, find f (-2)

A) - 27

B) - 11

C) - 3

D) 21

+2
Answers (2)
  1. 18 July, 05:47
    0
    D

    Step-by-step explanation:

    You have to be careful that you treat 21 as special. It is the only positive number. As you do the problem, keep an eye on 21.

    f (-2) = 3x^2 - 2x + 5 Put - 2 wherever you see an x

    f (-2) = 3 (-2) ^2 - 2 (-2) + 5 Calculate the first term.

    f (-2) = 3 (4) - 2 (-2) + 5 Remove the brackets of the second term

    f (-2) = 12 + 4 + 5 Combine

    f (-2) = 21
  2. 18 July, 07:04
    0
    Answer: D

    Step-by-step explanation:

    f (x) = 3x2 - 2x + 5

    f (-2) = 3 * (-2) ^2 - 2 * (-2) + 5

    f (-2) = 3*4 + 4 + 5

    f (-2) = 12 + 4 + 5

    f (-2) = 21
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