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8. Aaron was asked by his teacher to simplify a-2.1 on the board. He wrote his solution on the board this way: 0-1 a²-1 (a+1)(a-1) 1. Did he arrive at the correct answer? a2-a a(a-1) a. No, a is not a common factor of numerator. b. No, a must be cancelled out so that the answer is la. c. Yes, the LCD must be eliminated to simplify the expression. d. Yes, the expressions that he crossed out are all common factors. 9. Perform the indicated operation: 2 a. b. X-2 X+2 3 X+1 X+1 X-6 d.-2-10 - 6 6 6 6 3x² 3 10. Find the product of and 18x 2y xy2 d. ty2 - a. 12 3x23 b. *** C. 36 11. What will be the result when a and b are replaced by 2 and -1, respectively, in the expression (-5a2b)(-2a 302? A. 27 B. - 5 C.3 D. -2 16 16 7. 7 12. If x >0 and y
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