1,000,000 Question Thread :D

[TrueTears]

Let

INVERSE:







Then use the domain, range etc to pick which side you want.

[kenhung123]

where did you get the +1-1?

[TrueTears]

After interchanging right?

Now

[ yeah?]

The rest follows.

[kenhung123]

Let

INVERSE:







Then use the domain, range etc to pick which side you want.

Thanks I understand that part. The answer only gives the positive answer though. Why is that? Considering the domain of g is [-1,infinity)?

[TrueTears]

Now only the positive half satisfies this.

[kenhung123]

How do I prove that doesn't exist when we inverse ?

[TrueTears]

How do I prove that doesn't exist when we inverse ?

That's all I can deduce from the information given, since I don't know the domain of

[kenhung123]

Sorry I missed it. I added it back. Thanks for prompt reply.

[TrueTears]

How do I prove that doesn't exist when we inverse ?

Continuing on.

If we take the negative half:





Thus the negative half is what we want.

Try for yourself the same process as I just done to see why the positive is false.

[kenhung123]

Like in the exam, we want to cancel the negative equation, how do we show working? Or we can just pluck it out without any working?

[TrueTears]

Like in the exam, we want to cancel the negative equation, how do we show working? Or we can just pluck it out without any working?

You'd show why you would disregard the positive half just to be sure, you'd write down the little exercise I set you just then.

[NE2000]

Always explain what you're doing, if you can't explain using mathspeak then use normal words but you should always explain

[kenhung123]

How do we sketch the graph of ? How to determine shape and start point etc

[TrueTears]

Best way is to memorise the basic shapes of all the different families of graphs.

Or you can test some values and see what happens.

Eg, pick 1, 4, 9, 16 etc.

[kenhung123]

Thanks so much!