Q. 1 यदि 3(x2+1)-7x3x = 6 , x≠0 है तो , √x+1√x क्या होगा ?
[ SSC CGL MAINS 2019 ]
Solution - 3x2-7x+33x = 6
3x2-7x+3=18x
3x2-7x-18x+3=0
3x2-25x+3=0
Deviding by x bothsides we have
3x-25+3x=0
3x+3x=25
3(x+1x)=25
(x+1x)=253
On adding +2 bothsides we have
(x+1x)+2=253+2
(√x)2+(1√x)2+2×(√x)×(1√x)=313
(√x+ 1√x)2=313
On taking roots bothsides we have ...............
(√x+1√x)=√313
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Mathematics