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The integral is $\"\"$ .

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Here $\"\"$ , $\"\"$ and $\"\"$ .

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Graph the area the function of $\"\"$ under given intervals.

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Graph :

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Graph the function $\"\"$ in the interval $\"\"$ .

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$\"\"$

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Observe the graph:

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The area of the graph consists of two right angle triangles $\"\"$ and $\"\"$ .

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$\"\"$ .

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Consider $\"\"$

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$\"\"$

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Consider $\"\"$

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$\"\"$

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Substitute $\"\"$ and $\"\"$ in $\"\"$ .

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$\"\"$

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$\"\"$ .