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C1 Graph Question watch

1. Hello, my friend is stuck on a question and my knowledge of C1 has evaporated, could you give any tips on how to solve?

Figure 1 show the curve with equation y=f(x ) which crosses the x axis at the origin and the points A and B.

(a) given that f'(x )= 6-4x-3x^2 find an expression for y in terms of x.
(b) show that AB= k root 7 where k is an integer to be found.

All help would be appreciated.
2. (Original post by mathew551)
...
i). Integrate f'(x).
Determine the constant of integration by finding a point that the curve passes through.

ii) Factorise your f(x) and find the roots. Then AB is just the largest - smallest.
3. (Original post by ghostwalker)
i). Integrate f'(x).
Determine the constant of integration by finding a point that the curve passes through.

ii) Factorise your f(x) and find the roots. Then AB is just the largest - smallest.
"How would you find the point that the curve passes through, or is it just (0,0)?"
4. (Original post by mathew551)
"How would you find the point that the curve passes through, or is it just (0,0)?"
yes.
5. (Original post by titsmcgee)
yes.
So c equals 0?
6. (Original post by mathew551)
So c equals 0?
yupp

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