I dont understand these two
Evaluate the following expression using the values given:

Find x3 - 2y2 - 3x3 + z4 if x = 3, y = 5, and z = -3.

-185
-77
-23
85
&
Evaluate the following expression using the values given:

Find 3x2 - y3 - y3 - z if x = 3, y = -2, and z = -5

For both i got -50 and -35 which is obviously wrong! any help?

Question

I dont understand these two 
Evaluate the following expression using the values given:

Find x3 - 2y2 - 3x3 + z4 if x = 3, y = 5, and z = -3.

 -185
 -77
 -23
 85
&
Evaluate the following expression using the values given:

Find 3x2 - y3 - y3 - z if x = 3, y = -2, and z = -5

For both i got -50 and -35 which is obviously wrong! any help?

jhannybean · Answer

$$x^3-2y^2-3x^3+z^4$$

jhannybean · Answer

Just plug in your values.

jhannybean · Answer

$$(3)^3 -2(5)^2-3(3)^3+(-3)^4$$

anonymous · Answer

ah! thank you so much! Sorry im kinda brain dead right now and doing unnecessary stuff

jhannybean · Answer

for $3x^2-y^3-y^3-z$ simplify the expression first. $$3x^2-2y^3-z$$$$3(3)^2-2(-2)^3-(-5)$$

jhannybean · Answer

Good luck :)