Posted by T on Saturday, May 21, 2011 at 12:00pm.
I assume your problem is this:
2x^2 + 3xy - 4y^2
Note: you can use ^ to mean raised to the power of some value; for example x^2 means x raised to the power of 2 (or x squared).
Substitute 2 for x and -4 for y to evaluate the expression.
I hope this will help get you started.
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