anonymous
  • anonymous
Find x3 - 2y2 - 3x3 + z4 if x = 3, y = 5, and z = -3.
Mathematics
katieb
  • katieb
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Baby_Bear69
  • Baby_Bear69
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texaschic101
  • texaschic101
x^3 - 2y^2 - 3x^3 + z^4 ---- x = 3, y = 5, z = -3 now we sub 3^3 - 2(5^2) - 3(3^3) + (-3^4) can you do the math now ?
anonymous
  • anonymous
-185

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texaschic101
  • texaschic101
27 - 2(25) - 3(27) + 81 27 - 50 - 81 - 81 -212 + 27 -185 thats what I got
texaschic101
  • texaschic101
oops..made a mistake on first line...supposed to be -81
anonymous
  • anonymous
yep
texaschic101
  • texaschic101
same answer....-185
anonymous
  • anonymous
so it is -185
texaschic101
  • texaschic101
yes
anonymous
  • anonymous
i got it wrong
texaschic101
  • texaschic101
hold on...let me check again 3^3 - 2(5^2) - 3(27) + 81 ---- it is + 81 because -3^4 = -3*-3*-3*-3 = 81 27 - 50 - 81 + 81 - 23 (the 81's cancel each other out)
texaschic101
  • texaschic101
I am so sorry about that
anonymous
  • anonymous
can i ask you another question
anonymous
  • anonymous
??
anonymous
  • anonymous
Find -3a2 - b3 + 3c2 - 2b3 if a = 2, b = -1, and c = 3.

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