Jawabanmu

2014-01-22T19:34:41+07:00
 a^{2} = (2+ \sqrt{5} ) {2} = 4+ \sqrt{25} = 4+5 = 9
 b^{2} = 4- \sqrt{25} = 4-5 = -1
Jadi,  a^{2} -  b^{2} = 9 - (-1) = 9+1 = 10


a^{2} = (2+ \sqrt{5} ) {2} = 4+ \sqrt{25}
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ok..,sdh pham q mbak....