SOLUTION: I HAVE A PLACEMENT TEST AND THIS QUESTION IS TOUGH FOR ME HOW DO I ANSWER
2X^2+3XY-4Y^2 WHEN X=2 AND Y=-4 I HAVE TRIED MANY TIMES BUT I CANNOT FIGURE IT OUT!! PLEASE HELP ME SO I
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-> SOLUTION: I HAVE A PLACEMENT TEST AND THIS QUESTION IS TOUGH FOR ME HOW DO I ANSWER
2X^2+3XY-4Y^2 WHEN X=2 AND Y=-4 I HAVE TRIED MANY TIMES BUT I CANNOT FIGURE IT OUT!! PLEASE HELP ME SO I
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Question 193313: I HAVE A PLACEMENT TEST AND THIS QUESTION IS TOUGH FOR ME HOW DO I ANSWER
2X^2+3XY-4Y^2 WHEN X=2 AND Y=-4 I HAVE TRIED MANY TIMES BUT I CANNOT FIGURE IT OUT!! PLEASE HELP ME SO I PASS THIS TEST!! Answer by nerdybill(7384) (Show Source):
You can put this solution on YOUR website! Given:
2X^2+3XY-4Y^2 WHEN X=2 AND Y=-4
.
Plug in the given values and evaluate:
2(2)^2+3(2)(-4)-4(-4)^2
.
Evaluate using the order of precedence.
Exponents are first:
2(4)+3(2)(-4)-4(16)
Multiplication next -- left to right:
8-24-64
Addition/subtraction --left to right:
-16-64
Finally:
-80
