anonymous
  • anonymous
help will give medal Evaluate the following expression using the values given: Find x3 − 2y2 − 3x3 + z4 if x = 3, y = 5, and z = −3. (1 point) −185 −77 −23 85 I get - 26 but it not an answer
Mathematics
schrodinger
  • schrodinger
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NathaliaMA13
  • NathaliaMA13
if x = 3, y = 5, z = -3 The expression would be shown as (3)3 - 2(5)\[(3)^{3} - 2(5)^{2} - 3(3)^{3} + -3^{4}\]2
NathaliaMA13
  • NathaliaMA13
please ignore the half-way expressions on the top and bottom. lol
anonymous
  • anonymous
ok lol and I got that far but I don't know what to do from there cause I obviously did something wrong lol

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NathaliaMA13
  • NathaliaMA13
OK Let's work through this together. :-) What is \[3^{2}\] ??
NathaliaMA13
  • NathaliaMA13
i mean 3 to the 3rd power omg
anonymous
  • anonymous
9 lol bout to say that
NathaliaMA13
  • NathaliaMA13
now what is 2 x 5 to the 2 power?
anonymous
  • anonymous
100 ??
NathaliaMA13
  • NathaliaMA13
oh gosh. noooo
NathaliaMA13
  • NathaliaMA13
it's 50
NathaliaMA13
  • NathaliaMA13
I'll just simply give you the answer, it's -23
NathaliaMA13
  • NathaliaMA13
Try it on your computer's calculator. it will give you so much help lol
anonymous
  • anonymous
im so stupid :( lol
NathaliaMA13
  • NathaliaMA13
NO, don't ever say that. You just haven't gotten the hang of what your lesson's teaching you about. I can explain on how I did it . if youd like me to. ? (:
anonymous
  • anonymous
ya sure maybe ill see where I messed up again lol
NathaliaMA13
  • NathaliaMA13
ight ight (: so you know how the question tells you what number the variables mean? like x = 3, y = 5, z = -3 well, all you gotta do next time, is rewrite it on a piece of paper and basically substitute the variables to the numbers that the question listed. and if there's any powers, you multiply, and if there's any in parenthesis, you include that number in with what you're multiplying. is this making sense ? @shadow2239
anonymous
  • anonymous
so if it was 2 (5) ^2 I would add 2 +5 and do 6^2 ????
NathaliaMA13
  • NathaliaMA13
No, shadow. You would multiply, 2(5) means to multiply because they're close together and there's really nothing there to prove that you have to add. and well...since 2 x 5 equals 10, you multiply 10 twice.
NathaliaMA13
  • NathaliaMA13
because it has a power of 2.
anonymous
  • anonymous
so it would be 20 then ?
NathaliaMA13
  • NathaliaMA13
no no \[10^{2}\] does not mean 10 x 2 it means, 10 x 10. you're multiplying 10 TWICE not by two. :c
anonymous
  • anonymous
then it would be 100
NathaliaMA13
  • NathaliaMA13
Yes.
anonymous
  • anonymous
can you tell me if this is right -3(2)^2-(-1)^3+3(3)^2-2(-1)^3 I simplified and got 48 is that right ????

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