Answers

2015-09-21T13:15:02+05:30
X=7+√40

x=7+2√10
  =(√5)²+(√2)²+2×√2×√5
  =(√5+√2)²

√x=√5+√2
1/√x=1/√5+√2
      =√5-√2/3

√x+1/√x=√5+√2 + √5-√2/3
            =4√5+2√2/3
            ie 2/3( 2√5+√2)

hope this is helpful
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