Question 924719
give expression :  {{{ 2x^2+3xy-4y^2}}}
put x=2 & y=4 in above expression
             {{{2x^2+3xy-4y^2}}} = {{{ 2*(2)^2+3*2*4-4*4^2}}}
                                   ={{{ 2*4+24-4*16}}}
                                     ={{{8+24-64}}}
                                     ={{{32-64}}}
                                    = -32  
result is -32