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Think twice (Posted on 2016-09-12) Difficulty: 2 of 5
Solve for integer x:
x1/2+x1/4= 20

  Submitted by Ady TZIDON    
Rating: 5.0000 (1 votes)
Solution: (Hide)
2 answers: x1=256, x2=625
Solution: let t^4=x, then t^2+t-20=0
(t-4)*(t+5)=0
t=4, x=256; t=-5, x=625

Comments: ( You must be logged in to post comments.)
  Subject Author Date
SolutionAnswersMath Man2016-09-16 16:40:23
re: Algebraic solution. SpoilerAdy TZIDON2016-09-15 22:52:06
Algebraic solutionJayDeeKay2016-09-15 12:32:28
SolutionThe apparent solutionCharlie2016-09-12 10:33:10
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