$\"\"$

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The standard form of quadratic equation in x - variables is $\"\"$ , where $\"\"$ .

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The equation is $\"\"$ .

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Add $\"\"$ to each side.

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$\"\"$

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$\"\"$

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Add 72 to each side.

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$\"\"$

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$\"\"$ . $\"\"$

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Graph the related function $\"\"$ .

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$\"graph$

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Observe the graph, the graph intersect the x - axis at only one point $\"\"$ .

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So the equation has only one solutions and the solution is $\"\"$ . $\"\"$

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To check the first solution, substitute $\"\"$ in the original equation $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ (Solution checks) $\"\"$

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The solution is $\"\"$ .