#1**0 **

2a) (x-9)(x^{7}+x^{6}+x^{5}+x^{4}+x^{3}+x^{2}+x+1)

x^{8}+x^{7}+x^{6}+x^{5}+x^{4}+x^{3}+x^{2}+x+1-9x^{7}-9x^{6}-9x^{5}-9x^{4}-9x^{3}-9x^{2}-9x-9

**x ^{8}-8x^{7}-8x^{6}-8x^{5}-8x^{4}-8x^{3}-8x^{2}-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)(10^{7}+10^{6}+10^{5}+10^{4}+10^{3}+10^{2}+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