SOLUTION: 2x^2+3xy-4y^2 when x=2 and y=-4

Question 252911: 2x^2+3xy-4y^2 when x=2 and y=-4
Found 2 solutions by jim_thompson5910, drk:
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Start with the given expression.

Plug in and

Square 2 to get 4 and square -4 to get 16

Multiply

Combine like terms.

So when and
Answer by drk(1908) (Show Source): You can put this solution on YOUR website!
Here is the original equation:

Let: x = 2 and y = -4
--
step 1: replace x with 2 and y with -4 to get

use order of operations to simplify:

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