SOLUTION: show me the steps to figure this out. what is the value of the expression {{{2x^2+3xy-4y^2}}} when {{{x=2}}} and {{{y=-4}}}

 when  and 

Everywhere you see an  write  instead:
Everywhere you see a  write  instead:




Do exponents first.  Replace  by 
Replace  by 



Do multiplications next:

Replace  by 
Replace  by 
Replace  by 







Edwin