Question

Evaluate the following expression using the values given:
Find x3 - 2y2 - 3x3 + z4 if x = 3, y = 5, and z = -3

Answer 1

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 ?

Answer 2

so its 27 - 50 - 81 + -81

Answer 3

yes...if it makes it easier, write it like this..
27 - 50 - 81 - 81....do that and you will get you final answer

Answer 4

so the answer is -185

Answer 5

yes

Answer 6

can i ask another question??

Answer 7

sure can :)

Answer 8

here??

Answer 9

yes

Answer 10

or in another post

Answer 11

2x2 - 2z4 + y2 - x2 + z4 if x = -4, y = 3, and z = 2

Answer 12

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.

Answer 13

just remember, a neg times a neg is a positive

Answer 14

you need help ? You need me to start you off ?

Answer 15

-16 -16 + 9 - 8 + 16

Answer 16

2(16) - 2(16) + 9 - 16 + 16 ....you following this ??

Answer 17

yes

Answer 18

so the answer is 9

Answer 19

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.

Answer 20

yes..it is 9

Answer 21

thank you very much

Answer 22

glad to help :)