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(2 + √5)(2 + √5) 4 + 2√5 + 2√5 + 5 9 + 4√5
= ---------------------- = --------------------------- = -----------
2 - 5 -3 -3
= 4+2akar5+2akar5+5 / 2-5
=4+4akar5/-3+5
= -3+4akar
itu maksudnya dri awal 2+akar5 , di computer saya gk ada akar makanya saya buat + 5 aja , semoga membantu ya