anonymous
  • anonymous
Evaluate the following expression using the values given: Find x3 - 2y2 - 3x3 + z4 if x = 3, y = 5, and z = -3
Algebra
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SOLVED
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katieb
  • katieb
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texaschic101
  • texaschic101
just a matter of subbing... x^3 - 2y^2 - 3x^3 + z^4.......x = 3,y = 5, z = -3 3^3 - 2(5^2) - 3(3^3) + -3^4 = can you do the math and finish ?
anonymous
  • anonymous
so its 27 - 50 - 81 + -81
texaschic101
  • texaschic101
yes...if it makes it easier, write it like this.. 27 - 50 - 81 - 81....do that and you will get you final answer

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More answers

anonymous
  • anonymous
so the answer is -185
texaschic101
  • texaschic101
yes
anonymous
  • anonymous
can i ask another question??
texaschic101
  • texaschic101
sure can :)
anonymous
  • anonymous
here??
texaschic101
  • texaschic101
yes
anonymous
  • anonymous
or in another post
anonymous
  • anonymous
2x2 - 2z4 + y2 - x2 + z4 if x = -4, y = 3, and z = 2
texaschic101
  • texaschic101
same way... 2x^2 - 2z^4 + y^2 - x^2 + z^4....x = -4, y = 3, z = 2 sub 2(-4^2) - 2(2^4) + 3^2 -(-4^2) + 2^4.....you got to be very careful with your signs now, you take it from here....I will stay and check your work. If you have any questions at all, just ask. Take as long as you need.
texaschic101
  • texaschic101
just remember, a neg times a neg is a positive
texaschic101
  • texaschic101
you need help ? You need me to start you off ?
anonymous
  • anonymous
-16 -16 + 9 - 8 + 16
texaschic101
  • texaschic101
2(16) - 2(16) + 9 - 16 + 16 ....you following this ??
anonymous
  • anonymous
yes
anonymous
  • anonymous
so the answer is 9
texaschic101
  • texaschic101
now there is several things that cancel out here.....like the 2(16) and the -2(16) and the -16 and the + 16......leaving you with just 9 as your answer.
texaschic101
  • texaschic101
yes..it is 9
anonymous
  • anonymous
thank you very much
texaschic101
  • texaschic101
glad to help :)

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