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

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

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.