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29-03-2017
Mathematics

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x squared minus 4X minus 11 equals 0

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ghanami ghanami

29-03-2017

Hello:
x²-4x-1=0
(x²-2(2x) +2²)-2²-1=0
(x-2)² -5 = 0
(x-2)²-(√5)² = 0
(x-2-√5)(x-2+√5) = 0
(x-2-√5=0) or (x-2+√5 = 0)
x=2+√5 or x =2-√5

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