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# Someone help me solve this please watch

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1. I'm trying to do question 7 in exercise 8K in the blue C3 book. How do I solve it to find the range of values? The equation above is a differential of a function. I'm trying to find the range of values for which f(x) is an increasing function of x. How do I solve it?
2. Is that (i) or (ii)

In both cases take the term with the square root to the right hand side by addition/subtraction and square the whole inequality (which should be justified, I guess x > 0 is a restriction right? It should be for a C3 problem).

If you can't work out what to do next try this:
Spoiler:
Show

You then end up with something like . Multiply the across and solve like a typical inequality with polynomials (consider different cases for x if necessary).
3. (Original post by benwellsday)
Is that (i) or (ii)

In both cases take the term with the square root to the right hand side by addition/subtraction and square the whole inequality (which should be justified, I guess x > 0 is a restriction right? It should be for a C3 problem).

If you can't work out what to do next try this:
Spoiler:
Show

You then end up with something like . Multiply the across and solve like a typical inequality with polynomials (consider different cases for x if necessary).

Ah I get it now thanks

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Updated: January 17, 2010
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