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# C2 - Area between curve and x-axis watch

1. Hello. Last question on my homework. Please give me guidance?

I have to find the area between the curve of

One value of x is 4, not sure how to calculate the other. Help please?
2. The x=4 is definitely not a limit. The x-axis is where y = 0, so setting y = 0 gives you . We can rearrange this to get , the roots of this equation (say and , with ) are the limits of integration which you use to find the area under the curve.

Once you've found the roots of and , you can evaluate
3. 4 is a limit, how do I work out my other limit? I'm struggling on that bit.
4. (Original post by Coda)
Hello. Last question on my homework. Please give me guidance?

I have to find the area between the curve of

One value of x is 4, not sure how to calculate the other. Help please?
The area between the curve and what? Your question title says the x-axis so one of your limits will be a root of the function.
Find the roots and sketch the curve, it will be clearer.

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