document.write( "Question 942571: How would I multiply (5z-9)(5z+9)? This is what I have 25z-81. \n" ); document.write( "
Algebra.Com's Answer #574618 by rfer(16322)\"\" \"About 
You can put this solution on YOUR website!
25z^2+45z-45z-81
\n" ); document.write( "25z^2-81
\n" ); document.write( "You almost got, but 5z*5z=25z^2
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