+0  
 
0
186
2
avatar

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

Guest Sep 7, 2017
 #1
avatar
0

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
avatar
0

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

8 Online Users

avatar

New Privacy Policy

We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive information about your use of our website.
For more information: our cookie policy and privacy policy.