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MathematicsMathematics
6 January, 14:53

4a^2+8a-20=0

By completing the square

+2
Answers (2)
  1. 6 January, 18:04
    0
    4a² + 8a - 20 = 0

    a = - 8 + / - √ (8² - 4 (4) (-20))

    2 (4)

    a = - 8 + / - √ (64 + 320)

    8

    a = - 8 + / - √384

    8

    a = - 8 + / - 19.59591794

    8

    a = - 8 + 19.59591794 a = - 8 - 19.59591794

    8 8

    a = 11.59591794 a = - 27.59591794

    8 8

    a = 1.449489743 a = - 3.443813782
  2. 6 January, 18:15
    0
    I'm not sure but I think it is a=-1± 6√

    a≈1.44948974, - 3.44948974
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