Simplify the following please. Been a very long time since I have had to do this and need as much help as possible.
1: 3(2x - 4)(x - 1) - 4(x - 3)(5x + 2)
2: (-3)^5
3: (-5)^0
4: 4^7 ÷ 4^2
Need help with possibly explanation on how to answer the following math questions.?
2016-07-08 4:29 pm
回答 (2)
2016-07-08 8:21 pm
✔ 最佳答案
1.) 3(2x - 4)(x -1) - 4(x - 3)(5x + 2)= 3(2x^2 - 2x - 4x + 4) - 4(5x^2 + 2x - 15x - 6)
= 3(2x^2 - 6x + 4) - 4(5x^2 - 13x - 6)
= (6x^2 - 18x + 12) - (20x^2 - 52x - 24)
= 6x^2 - 18x + 12 - 20x^2 + 52x + 24
= -14x^2 + 34x + 36.
__________________________________________________________________________
2.) (-3)^5
= -3 * -3 * -3 * -3 * -3
= 9 * 9 * -3
= 81 * -3
= -243.
__________________________________________________________________________
3.) (-5)^0 = -5/-5 = 1.
x^0 = 1...FOR ALL NONZERO X. 0^0 = 0/0 = indeterminate.
__________________________________________________________________________
4.) 4^7 ÷ 4^2 = 4^(7 - 2) = 4^5 = 16 * 16 * 4 = 256 * 4 = 1024.
2016-07-08 4:35 pm
1:
3(2x - 4)(x - 1) - 4(x - 3)(5x + 2)
= 3(2x² - 2x - 4x + 4) - 4(5x² + 2x - 15x - 6)
= 3(2x² - 6x + 4) - 4(5x² - 13x - 6)
= 6x² - 18x + 12 - 20x² + 52x + 24
= -14x² + 34x + 34
====
2:
(-3)^5
= (-1)^5 (3)^5
= -243
====
3:
For all real x, x^0 = 1
(-5)^0 = 1
====
4:
4^7 ÷ 4^2
= 4^(7 - 2)
= 4^5
= 1024
3(2x - 4)(x - 1) - 4(x - 3)(5x + 2)
= 3(2x² - 2x - 4x + 4) - 4(5x² + 2x - 15x - 6)
= 3(2x² - 6x + 4) - 4(5x² - 13x - 6)
= 6x² - 18x + 12 - 20x² + 52x + 24
= -14x² + 34x + 34
====
2:
(-3)^5
= (-1)^5 (3)^5
= -243
====
3:
For all real x, x^0 = 1
(-5)^0 = 1
====
4:
4^7 ÷ 4^2
= 4^(7 - 2)
= 4^5
= 1024
收錄日期: 2021-04-30 14:33:08
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20160708082904AAppxjq