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3 June, 07:34

Sydney was asked whether the following equation is an identity: (2x^2-18) (x+3) (x-3) = 2x^4-36x^2+162

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Answers (2)
  1. 3 June, 07:58
    0
    Yes it is.

    See below.

    Step-by-step explanation:

    (2x^2-18) (x+3) (x-3)

    = (2x^2 - 18 (x^2 - 9)

    = 2x^4 - 18x^2 - 18x^2 + 162

    = 2x^4 - 36x^2 + 162.

    The left side transforms to the right side so it is an identity.
  2. 3 June, 08:35
    0
    Any value of x x makes the equation true. All real numbers Interval Notation: ( - ∞, ∞).
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