[" 73.If "x,y,z" not all zeros and the e...

[" 73.If "x,y,z" not all zeros and the equations "],[x+y+z=0, (1+a)x+(2+a)y-8z=0],[x-(1+a)y+(2+a)z=0" have non-trivial "],[" solution then "a=],[[" 1) "2+sqrt(15)," 2) "3+-sqrt(15)],[" 3) "sqrt(15)," 4) "-5+-2sqrt(2)]]

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