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13 March, 00:39

Find the value of 2a² + 5b² when a = - 6 and b = 2

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Answers (2)
  1. 13 March, 02:03
    0
    2 (-6^2) + 5 (2^2)

    2 (36) + 5 (4)

    72+20

    92
  2. 13 March, 02:53
    0
    Plug in the values - 6 into 'a' and 2 into 'b'.

    2a² + 5b²

    2 (-6) ² + 5 (2) ²

    First solve the exponents ⇒ - 6² means - 6 * - 6, which equals 36

    2² = 2*2 = 4

    2 (36) + 5 (4)

    2*36 → 72

    5*4 = 20

    72 + 20 = 92

    Final answer → 92
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