document.write( "Question 89205: Find the solution set for
\n" ); document.write( "x^2-21=4x \n" ); document.write( "

Algebra.Com's Answer #64840 by Nate(3500) $\"\"$ $\"About$

You can put this solution on YOUR website!
x^2 - 21 = 4x
\n" ); document.write( "x^2 - 4x - 21 = 0
\n" ); document.write( "x^2 - 7x + 3x - 21 = 0
\n" ); document.write( "(x^2 - 7x) + (3x - 21) = 0
\n" ); document.write( "x(x - 7) + 3(x - 7) = 0
\n" ); document.write( "(x + 3)(x - 7) = 0
\n" ); document.write( "x = -3 and 7 \n" ); document.write( "

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