document.write( "Question 83719: x to the second power - 16y to the second power.\r \n" );
document.write( "\n" );
document.write( "x^2-16y^2 \n" );
document.write( "factor this out: \n" );
document.write( "(x-4y)(x+4y)---Your answer! \n" );
document.write( "Check your answer: FOIL Method \n" );
document.write( "x^2+4xy-4xy-16y^2= x^2-16y^2 \n" );
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