1) I don't unbderstand where the 'i' comes from iin your answer. What is

? Then solve.

2)You must know your formulae!!

3) Use the same formula, but here, you'll have the square root of x instead of x.

4) Solve normally, i.e. subtract 5 from both sides, then divide both sides by 2. Keep the '<' symbol.

5) Solve normally, i.e. add 1 to both sides, then divide both sides by 3. Lastly, put square root on both sides. But then, remember that the value of x may be positive or negative, so put both.

6) Same as 2)

7) That's more complicated. See my explanation that i gave you a while back

https://www.askmehelpdesk.com/math-s...ml#post1293230
8) The two bars surrounding the x (modullus) show that for any value of x, the answer will be positive. As the result is 6, x must be either 6 or -6. Little mistake i think in your given answer

9) Same as in 3)

10) Expand normally then simplify. That's relatively easy!

11) Expand or use your formula:

12) What is

and

?

13) same as in 2) and 6)

14) Same as in 2), 6), and 13). But here, you can also factorise by putting the x outside 9better if you take the 5 also since both terms are divisible by 5x):

or

Then solve.

Hope that helped. Just remember your basic formulae, and all will be fine.