Cbse class 9 Maths revision tym


#1

If a=5+2 root 6 and b=1/a, then what will be the value of a^2+b^2 ??
Pls help me :thinking::thinking:


#2

A=5+2√6, b=1/a=1/(5+2√6)

a²+b²=a²+1/a²
=(5+2√6)²+1/(5+2√6)²
=(25+24+10√2)+1(5-2√6)²/(5+2√6)²(5-2√6)²
=(49+10√2)+(5-2√6)²/(5²-2√6²)
=(49+10√2)+(25+24-10√2)/(25-24)
=(49+10√2)+(49-10√2)/1
=49+10√2+49-10√2
=98