Math 8R: Homework Check - Part 3

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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 -

    #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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