$\"\"$

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The equation is $\"\"$ .

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$\"\"$ (Subtract 15 from each side)

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$\"\"$ (Apply additive inverse property: $\"\"$ )

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$\"\"$ . (Subtract: $\"\"$ )

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

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Above values substitute in $\"\"$ .

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$\"\"$

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$\"\"$ (Evaluate powers: $\"\"$ )

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$\"\"$ (Multiply: $\"\"$ )

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$\"\"$ (Multiply: $\"\"$ )

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$\"\"$ (Add: $\"\"$ )

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$\"\"$ (Multiply: $\"\"$ ) $\"\"$

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$\"\"$ (Square root property: $\"\"$ )

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$\"\"$ (Apply distributive property: $\"\"$ )

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$\"\"$ (Divide: $\"\"$ )

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$\"\"$ (The value of $\"\"$ )

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$\"\"$

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$\"\"$ (Simplify)

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$\"\"$

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The roots are $\"\"$ .