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![= \frac{1}{8}\left [ \left ( 4x+5 \right )^{2} \right ]^{0}_{-1}-\frac{1}{2}\left [ \left ( 5-x \right )^{2} \right ]^{3}_{0}-\frac{1}{8}\left [ \left ( x+5 \right )^{2} \right ]^{3}_{-1}](https://entrancecorner.codecogs.com/gif.latex?%3D%20%5Cfrac%7B1%7D%7B8%7D%5Cleft%20%5B%20%5Cleft%20%28%204x+5%20%5Cright%20%29%5E%7B2%7D%20%5Cright%20%5D%5E%7B0%7D_%7B-1%7D-%5Cfrac%7B1%7D%7B2%7D%5Cleft%20%5B%20%5Cleft%20%28%205-x%20%5Cright%20%29%5E%7B2%7D%20%5Cright%20%5D%5E%7B3%7D_%7B0%7D-%5Cfrac%7B1%7D%7B8%7D%5Cleft%20%5B%20%5Cleft%20%28%20x+5%20%5Cright%20%29%5E%7B2%7D%20%5Cright%20%5D%5E%7B3%7D_%7B-1%7D)
![= \frac{1}{8}\left [ 25-1 \right ]-\frac{1}{2}\left [ 4-25 \right ]-\frac{1}{8}\left [ 64-16 \right ]](https://entrancecorner.codecogs.com/gif.latex?%3D%20%5Cfrac%7B1%7D%7B8%7D%5Cleft%20%5B%2025-1%20%5Cright%20%5D-%5Cfrac%7B1%7D%7B2%7D%5Cleft%20%5B%204-25%20%5Cright%20%5D-%5Cfrac%7B1%7D%7B8%7D%5Cleft%20%5B%2064-16%20%5Cright%20%5D)
On solving we get A(-1,1) B(0,5) and C(3,2)