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}}}

Algebra.Com
Question 206750: show me the steps to figure this out.
what is the value of the expression
when and
Answer by Edwin McCravy(20056)   (Show Source): You can put this solution on YOUR website!

 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
RELATED QUESTIONS

what is the value of the expression 2x to the second power + 3xy - 4y to the second power (answered by rfer)
What is the value of the expression 2x2+3xy-when x=2 and y=... (answered by rfer)
what is the value of the expression 2x2+3xy-4y2 when x=2 and... (answered by RiverBaggett,mananth)
Will you please show the steps to work this problem? If x=-1 and y=2, what is the value... (answered by Fombitz)
Can you please show the work on this for me? x=2 y=-4 the answer is -80 2x^2+3xy-4y^2 (answered by bucky)
what is the value of the expression of 2x squared plus 3xy minus -4y2 when x = 2 and y =4 (answered by srinivas.g)
if x=-1 and y=2,what is the value of the expression... (answered by fractalier)
if x=-1 and y=2 what is the value of the expression... (answered by Alan3354)
COULD SOMEONE SHOW ME THE STEPS TO SOLVE THE FOLLOWING PROBLEMS: 1.WHAT EXPRESSION... (answered by scott8148)