Anyone knows how to do questions 7 and 8? 15

7) Certainly there is a typo in the statement, just see that the expression of item (ii) is different from that of item (i). Probably the correct expression is: . With this consideration, we can continue.

(i) Let E the expression that we are analyzing:



Since (x-1)² is a perfect square, it is a positive number. So, E is a result of a sum of two positive numbers, 2(x-1)² and 3. Hence, E is a positive number, too.

(ii) Manipulating the expression:



So, it's the case when E=0. However, E is always a positive number. Then, there is no real number x that satisfies the expression.

8) Let E the expression that we want to calculate:



Multiplying by (2-1) in the both sides:

Repeating the process, we obtain: