T Taraaaa New member Jul 12, 2009 #1 studying online and I'm having troubl? This is the equation: What is the value of the expression 2x² + 3xy - 4y² when x = 2 and y = -4 Could someone please help me understand how to do this?
studying online and I'm having troubl? This is the equation: What is the value of the expression 2x² + 3xy - 4y² when x = 2 and y = -4 Could someone please help me understand how to do this?
C califrniateach New member Jul 12, 2009 #2 just replace all the x's with 2 and the y's with -4. Then simplify it.
