document.write( "Question 484832: (z-8)^2-7=0 \n" ); document.write( "
Algebra.Com's Answer #331658 by nerdybill(7384)\"\" \"About 
You can put this solution on YOUR website!
(z-8)^2-7=0
\n" ); document.write( "(z-8)(z-8)-7=0
\n" ); document.write( "apply FOIL:
\n" ); document.write( "z^2-16z+64-7 = 0
\n" ); document.write( "z^2-16z+57 = 0
\n" ); document.write( "Since it can't be factor, applying the \"quadratic formula\" yields:
\n" ); document.write( "z = {5.354, 10.646}
\n" ); document.write( ".
\n" ); document.write( "There is another way to do it...
\n" ); document.write( "(z-8)^2-7=0
\n" ); document.write( "(z-8)^2 = 7
\n" ); document.write( "take square root of both sides:
\n" ); document.write( "z-8 = +-sqrt(7)
\n" ); document.write( "z = +-sqrt(7) + 8
\n" ); document.write( "which gives you the same:
\n" ); document.write( "z = {5.354, 10.646}\r
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