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3 January, 11:46

2n^2 - 20

n = 5

?

+3
Answers (2)
  1. 3 January, 12:03
    0
    Use this:

    n1,2 = - b + - √b²-4*a*c / 2a

    a = 2n (2)

    b = - 20

    c = - 5 (you have to subtract 5 to get 0)
  2. 3 January, 12:52
    0
    2n^2-20=0

    2n^2=20

    n^2=20:2

    n^2=10

    n=radical 10
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