if a = 2 + root 3 , find a^2 + 1/a^2
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Answered by
1
a^2=7+4root3
1/a^2=1/7+4root3
=(1/7+4root3)(7-4root3/7-4root3)
since by rationalisation
=7-4root3
a^2+1/a^2=7+4root3+7-4root3
=14
1/a^2=1/7+4root3
=(1/7+4root3)(7-4root3/7-4root3)
since by rationalisation
=7-4root3
a^2+1/a^2=7+4root3+7-4root3
=14
jpdpriya:
tq brother
thanks
jpdpriya
in which class u read because this question is in my book
10th , my sis has this doubt , I asked for clarification
tq very much
but i read in 9
hmmmm
Answered by
1
yes answer is absolutely 14 this question present in support material of class 9
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