Math, asked by kuku9694, 1 year ago

do this 16 no. question​

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Answered by MrKhan963
0

Answer:

Bhai kya pehle mam or aaj sham to hata k bhj tabhi to hofa

Answered by nithyasrinivasan2009
1

Answer:

Step-by-step explanation:

x=(2+√5)

x²+1/x²=(2+√5)²+1/(2+√5)²

           =(4+4√5+5) + 1/(4+4√5+5)

           =(9+4√5) + 1/(9+4√5)

            =(9+4√5)² / (9+4√5)  +1 /(9+4√5)

             =(81+80+8√5) +1 /(9+4√5)

              =161+8√5+1 / 9+4√5

               =162  +8√5 / 9+4√5

                =(162+8√5)(9-4√5) / (9+4√5)(9-4√5)

                ={162*(9-4√5) +8√5(9-4√5) / 9²-(4√5)²

                =   1458-648√5+72√5-160 / 81-80

                 =1458-160+72√5-648√5 /1

                  =1298-576√5

                   =2(649-288√5)

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