$\"\"$

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The differential equation is $\"\"$ .

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$\"\"$

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Apply integration on each side.

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$\"\"$

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$\"\"$

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Consider $\"\"$ .

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Rewrite the integral as $\"\"$ .

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Consider $\"\"$ .

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Write the expression ( $\"\"$ ) into perfect suare trinomial.

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Add and subtract $\"\"$ coefficient of the expression.

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$\"\"$

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Thus, the integral can be written as $\"\"$ .

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Let $\"\"$ , then $\"\"$ .

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$\"\"$

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

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$\"\"$

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Apply formula : $\"\"$ .

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$\"\"$

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Replace $\"\"$ with $\"\"$ .

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$\"\"$

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$\"\"$ .

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$\"\"$

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Substitute $\"\"$ in equation (1).

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$\"\"$ .

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$\"\"$

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$\"\"$ .