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21 September, 08:21

Evaluate 3x2 - 2xy + 4y2 for x=-2 and y=-1.

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Answers (2)
  1. 21 September, 10:19
    0
    The answer is 12

    Step-by-step explanation:

    3x² - 2xy + 4y²

    Let x = - 2

    y = - 1

    3 (-2) ² - 2 (-2) (-1) + 4 (-1) ²

    = 3 (4) - 2 (2) + 4 (1)

    = 12 - 4 + 4

    = 12
  2. 21 September, 11:13
    0
    3 x 2 - 2 ( - 2 x - 1) + 4 ( - 1 x 2) = - 6
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