![\"\"](\"/images/stars/stars-10.gif\")
You can put this solution on YOUR website!
So we are required to make a rational expression.
\n" ); document.write( "Lets make this an expression in 'x'.
\n" ); document.write( "Then as per the question,-3 and 4 are not allowable replacements.
\n" ); document.write( "
\n" );
document.write( "Now suppose we equate this,
\n" );
document.write( "x=-3 ie. x+3=0
\n" );
document.write( "x=4 ie. x-4=0
\n" );
document.write( "
\n" );
document.write( "Take some other random variable,and let this be 'y'.
\n" );
document.write( "Then we get
\n" );
document.write( "
\n" );
document.write( "Here,x cannot be -3,since that would make the denominator 0,and division by zero is not allowed.
\n" );
document.write( "Now,what if 4 was put in this place? That would make the denominator=4+3=7.
\n" );
document.write( "
\n" );
document.write( "So to solve this problem lets put y=7
\n" );
document.write( "
\n" );
document.write( "If value of x in this is '-3',then the expression becomes void (division by 0).
\n" );
document.write( "Otherwise it becomes 7/7=0 which simplifies to 1=0,which is not possible and hence cannot be allowed.
\n" );
document.write( "
\n" );
document.write( "In fact,any value put for y here gets equated to zero,so this expression anyways makes any value put for x null.
\n" );
document.write( "
\n" );
document.write( "Hope this helps,
\n" );
document.write( "Prabhat