Let there be X numberthen x= √20+( √20+( √ 20...x= sqrt(20+x)squaring both sidesx2 =20 +xx2 -x-20=0x2-5x+4x-20=0x (x-5)+4 (x-5 )=0(x+4)(x-5)=0x= -4 or 5since x cannot be -ve x=5
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