Small correction.. It should be (5-6)- 2 = -3 whereas 5-(6-2) = 1 Cheers! I think you are missing something really small. (5+6)+2 = 13 ; 5+(6+2) = 13 so its fine. But (5-6)-1 = -2 ; whereas 5-(6-2) = 1-4 = -3 so st 2 is not suffcient Hope you are not forgetting the PEMDAS rule, must solve the parant...

So we are looking for finite values of X A. x^4 >= 1 x >= 1 OR x <= -1 - wrong B. x^3 <= 27 x <= 3 - x could take any negative no less than/equal to 3 - wrong C. x^2 >= 16 x >= 4 OR x <= -4 wrong D. 2<= |x| <= 5 2 <= x <= 5 OR -2 >= x >= -5 - two options/lin...