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Can you help with some simple algebra?
2) Given that A+ 3x + 5y + z and B = 8x - 3y - 5z, find: i A+B ii A-B
3) From the square of -5x, take away the square of -3x
4) Explain why each statement is incorrect, and write the correct answers:
a. 4 X 2k + 3k = 20k
b. 40mn / 5m X 2n = 4
c. 8 X 4p -5p X 3 = -24p
d.8z + 18z^2 X 6/ 3z = 9z
Sorry for all the questions!! Please answer all the questions the best you can!! All answers are appreciated !! Thanks xoxox
1 Answer
- 8 years ago
2) A+B = 3x+5y+z+8x-3y-5 = 11x+2y-4z, A-B = 3x+5y+z-8x+3y+5z = -5x+8y+6z
3)square of -5x = 25x^2 and square of -3x = 9x^2 so the answer is 25x^2 - 9x^2 = 16x^2
4) a. here 4 X 2k + 3k = 11k not 20k so it is incorrect
b. here 40mn/5m X 2n = 80mn^2 / 5m = 16n^2 not 4 so it is incorrect
c. here 8 X 4p - 5p X 3 = 32p - 15p = 17p not -24p so it is incorrect
d. here 8z + 18z^2 X 6/ 3z = 8z + 18z^2 X 2/z = 8z + 36z = 44z not 9z so it is incorrect
