document.write( "Question 1391: Using completing the square what is x? x^2-14x+49 = 64 \n" ); document.write( "
Algebra.Com's Answer #431 by usyim88hk(158)\"\" \"About 
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x^2 - 14x + 49 = 64
\n" ); document.write( "So we should take out 64 from both sides
\n" ); document.write( "x^2 - 14x + 49 - 64 = 64 - 64
\n" ); document.write( "x^2 - 14x -15 = 0
\n" ); document.write( "Then add 15 to both sides
\n" ); document.write( "x^2 - 14x - 15 + 15 = 0 + 15
\n" ); document.write( "x^2 - 14x = 15
\n" ); document.write( "Now complete the square
\n" ); document.write( "x^2 - 14x + (-14/2)^2 = 15 + (-14/2)^2
\n" ); document.write( "x^2 - 14x + 49 = 64
\n" ); document.write( "Now factor x^2 - 14x + 49
\n" ); document.write( "(x-7)^2 = 64
\n" ); document.write( "(x-7) = 8 or (x-7) = -8
\n" ); document.write( "x-7 = 8 or x-7 = -8
\n" ); document.write( "x = 15 or x = -1
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