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18 July, 04:45

Use the quadratic formula to solve 7c^2 + 8c + 1 = 0

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  1. 18 July, 05:02
    0
    7c² + 8c + 1 = 0

    c = - (8) + / - √ ((8) ² - 4 (7) (1))

    2 (7)

    c = - 8 + / - √ (64 - 28)

    14

    c = - 8 + / - √ (36)

    14

    c = - 8 + / - 6

    14

    c = - 8 + 6 c = - 8 - 6

    14 14

    c = 2 c = - 14

    14 14

    c = ¹/₇ c = 1

    The solution is equal to { 1, ¹/₇}.
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