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19 December, 17:25

What is the sum of 5 (-3.4k-7) (3k 21) =

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  1. 19 December, 17:38
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    I am assuming that the correct equation is 5 (-3.4k - 7) + (3k 21) to get the sum.

    distribute multiplication:

    5 (-3.4k) - 5 (7) + (3k*21) = 0

    -17k - 35 + 63k = 0

    Look for k:

    -17k + 63k = 35

    46k = 35

    46k / 46 = 35 / 46

    k = 0.76

    Substitute k with 0.76

    5 (-3.4k - 7) + (3k21) = 0

    5[ (-3.4) (0.76) - 7] + [{ (3) (0.76) }21] = 0

    5 (-2.584 - 7) + (2.28) (21) = 0

    5 (-2.584) - 5 (7) + 47.88 = 0

    -12.92 - 35 + 47.88 = 0

    - 47.92 + 47.88 = 0.04
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