document.write( "Question 165924: x,y,z are real number. if xyz=78 and x^2+y^2+z^2=206, determine x+y+z \n" ); document.write( "

Algebra.Com's Answer #122310 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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x,y,z are real number. if xyz = 78 and x^2+y^2+z^2=206, determine x+y+z
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\n" ); document.write( "Assume that one of the variables = 1 (z)
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\n" ); document.write( "Three factors of 78: x=6, y=13, z=1
\n" ); document.write( "Then
\n" ); document.write( "6^2 + 13^2 + 1^2 = 206
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\n" ); document.write( "x+y+z sum:
\n" ); document.write( "6 + 13 + 1 = 20
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