Homework Help: Math 8R: Homework Check - Part 3

Posted by Laruen on Monday, October 29, 2012 at 2:31pm.

Part 3 : Evaluate when x = -2, y = 5

21. 4x + 2y, Answer: 2

22. 3(x) *to the 3rd power*, Answer: -221

23. (x + y) *to the 2nd power*, Answer: 9

24. -4x + 2y, Answer: 18

Please check to see if my answers are correct. Thank You!!! :)

Math 8R: Homework Check - Part 3 - Steve, Monday, October 29, 2012 at 2:51pm
#21. ok

#22.
3x^3 = 3(-2)^3 = 3(-8) = -24
(3x)^3 = (-6)^3 = -216
Not sure how you came up with -221, since 221 is neither a perfect cube, nor a multiple of 3.

#23. ok

#24. ok

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