do this 16 no. question
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Bhai kya pehle mam or aaj sham to hata k bhj tabhi to hofa
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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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