Jawabanmu

2014-08-19T18:03:53+07:00
Misalkan
a = 5
b =  2\sqrt{6}
Maka
( a + b ) ( a - b ) =   a^{2} -  b^{2} =  5^{2} - ([tex] 2\sqrt{6} )^{2}[/tex] = 25 - 4*6 = 25 - 24 = 1

1 4 1