document.write( "Question 499304: I need to find the solution to the equation $\"+160z%5E2=640+\"$ by factoring. I know the first step is to set the equation equal to zero by subtracting 640 from both sides, leaving me with $\"+160z%5E2-640=0+\"$ , and I then factored out the common factor, 80. I now have $\"+80%282z%5E2-8%29=0+\"$ . I don't know where to go from there. \n" ); document.write( "

Algebra.Com's Answer #337539 by Maths68(1474) $\"\"$ $\"About$

You can put this solution on YOUR website!
Instead of taking 80 common take 160 then equation will be
\n" ); document.write( "160(z^2-4)=0
\n" ); document.write( "Divide by 160 both sides of the above equation.
\n" ); document.write( "160(z^2-4)/160=0/160
\n" ); document.write( "z^2-4=0
\n" ); document.write( "z^2=4
\n" ); document.write( "Take squar root both sides
\n" ); document.write( "sqrtZ^2=sqrt4
\n" ); document.write( "z=2 or z=-2\r
\n" ); document.write( "\n" ); document.write( "OR
\n" ); document.write( "160z^2=640
\n" ); document.write( "Divide by 160 both sides of the above equation.
\n" ); document.write( "160(z^2)/160=640/160
\n" ); document.write( "z^2=4
\n" ); document.write( "Take squar root both sides
\n" ); document.write( "sqrtZ^2=sqrt4
\n" ); document.write( "z=2 or z=-2\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

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