SOLUTION: Okay, I have this problem I got wrong on my test but I thought I got it right. Evaluate the expression below if x=-1 and y=3

Question 901534: Okay, I have this problem I got wrong on my test but I thought I got it right.

Evaluate the expression below if x=-1 and y=3
3x^2-y^2
I got -12, but my teacher check it as wrong so I went to the online calculator it also said -12. I am confused please help.
cmur9133

Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
Evaluate for and .

Substitute assigned values:

Compute the expression:

RELATED QUESTIONS
How many different letter arrangements are possible using all the letters in the word... (answered by stanbon)

I tried doing this, but got it wrong, can someone please help? Evaluate the expression (answered by lynnlo)

Hi, I have a question on a problem I thought I did correctly off a test.... (answered by ankor@dixie-net.com)

-3xyz(squared) x=-4 y=-2 z=1\2 okay when i put this equation in my TI calculator i... (answered by nerdybill)

y/4 + 1 = C I started working this problem out. I started by multiplying by 4 on both... (answered by josgarithmetic,MathTherapy,Alan3354)

Do not use negative exponents y^-5*y. I had worked this problem out and got it wrong on... (answered by Alan3354)

Evaluate the expressions when x = (-5) , y = 3 , and z = 2, 2x + 9y +5z (answered by math-vortex)

if i got 83% on my test how do i find out how much i got right and how much i got wrong? (answered by jim_thompson5910)

Okay, I asked this one Friday and nobody got back to me so I am asking it again. Here is... (answered by jim_thompson5910)