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I'm so confused on this question. Please help!

Guest Sep 7, 2017
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 #1
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2a) (x-9)(x7+x6+x5+x4+x3+x2+x+1)

x8+x7+x6+x5+x4+x3+x2+x+1-9x7-9x6-9x5-9x4-9x3-9x2-9x-9

x8-8x7-8x6-8x5-8x4-8x3-8x2-8x-8

 

2b) (10)8-8(10)7-8(10)6-8(10)5-8(10)4-8(10)3-8(10)2-8(10)-8

100,000,000-80,000,000-8,000,000-800,000-80,000-8,000-800-80-8

11,111,112

 

2c) (10-9)(107+106+105+104+103+102+10+1)

(1)(11,111,111)

11,111,111

 

2d) Jeremy was incorrect; 11,111,112≠11,111,111

Guest Sep 8, 2017
edited by Guest  Sep 8, 2017
 #2
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Your expansion of: x^8 - 8x^7 - 8x^6 - 8x^5 - 8x^4 - 8x^3 - 8x^2 - 8x - 8, has the last term as -8. It should be -9. Therefore, 2b and 2c are equivalent.

Guest Sep 8, 2017

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