find the value of K
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1/3 x {8(-2k+5) + 3(-5-1) + k(1+2k)} = 0
1/3 x { -16k + 40 -18 + k + 2k^2 } = 0
1/3 x {2k^2 -15k + 22} = 0
2k^2 - 15k + 22 = 0
2k^2 - 11k - 4k + 22 = 0
k(2k - 11) - 2(2k - 11)
(k-2)(2k-11)
k = 2 or 5.5
1/3 x { -16k + 40 -18 + k + 2k^2 } = 0
1/3 x {2k^2 -15k + 22} = 0
2k^2 - 15k + 22 = 0
2k^2 - 11k - 4k + 22 = 0
k(2k - 11) - 2(2k - 11)
(k-2)(2k-11)
k = 2 or 5.5
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