O Ocean New member Joined Apr 21, 2019 Messages 15 Apr 21, 2019 #1 Hello, I was wondering if you could help me with this question. The answer is 4/21 but I can’t seem to get to it. Simplify [7^(2x+1) - 7^(2x-1) - 48] / [36 * 7^(2x) - 252]
Hello, I was wondering if you could help me with this question. The answer is 4/21 but I can’t seem to get to it. Simplify [7^(2x+1) - 7^(2x-1) - 48] / [36 * 7^(2x) - 252]
Steven G Elite Member Joined Dec 30, 2014 Messages 14,603 Apr 21, 2019 #2 Hint: 7a+b=7a7b and note that (2x+1) = 2+ (2x-1)
Steven G Elite Member Joined Dec 30, 2014 Messages 14,603 Apr 21, 2019 #3 7(2x+1)- 7(2x-1) - 48 = 7(2x-1)( 49 -1) - 48 = 48( 7(2x-1) - 1) = 48( 49x * 7-1 - 1) 36 * 72x - 252 = 36*72x - 36*7 = 36(49x-7) What you see above should be very helpful. Last edited: Apr 21, 2019
7(2x+1)- 7(2x-1) - 48 = 7(2x-1)( 49 -1) - 48 = 48( 7(2x-1) - 1) = 48( 49x * 7-1 - 1) 36 * 72x - 252 = 36*72x - 36*7 = 36(49x-7) What you see above should be very helpful.
