Hi RainbowRevolution,

For the first one we have,

If we sub in straight into we get

Clearly the cancels to give . One problem is the question says to write for x however there is no x term present....

You where right upto the point where you said

Actually you had not and thus equation should actually be

which cancels to

The second looks right to me but we can do a bit of tidying up. We have

and thus,

Hope this helps.