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Express the radical using the imaginary unit, 
i.
Express your answer in simplified form.

+-sqrt(-72)=+-◻

Express the radical using the imaginary unit, i i .\newlineExpress your answer in simplified form.\newline±72=± \pm \sqrt{-72}= \pm \square

Full solution

Q. Express the radical using the imaginary unit, i i .\newlineExpress your answer in simplified form.\newline±72=± \pm \sqrt{-72}= \pm \square
  1. Expressing 72\sqrt{-72}: First, we need to express ±72\pm\sqrt{-72} as the product of the square root of a positive number and the square root of 1-1.\newline±72=±1×72\pm\sqrt{-72} = \pm\sqrt{-1 \times 72}
  2. Recognizing 1\sqrt{-1}: Next, we recognize that 1\sqrt{-1} is the definition of the imaginary unit ii.
    ±172=±172=±i72\pm\sqrt{-1 \cdot 72} = \pm\sqrt{-1} \cdot \sqrt{72} = \pm i \cdot \sqrt{72}
  3. Simplifying 72\sqrt{72}: Now, we simplify 72\sqrt{72}. Since 7272 is 3636 times 22 and 3636 is a perfect square, we can simplify further.\newline72=36×2=36×2=6×2\sqrt{72} = \sqrt{36 \times 2} = \sqrt{36} \times \sqrt{2} = 6 \times \sqrt{2}
  4. Multiplying by the imaginary unit i: Finally, we multiply the simplified square root by the imaginary unit i. \newline±i72=±i62=±6i2\pm i \cdot \sqrt{72} = \pm i \cdot 6 \cdot \sqrt{2} = \pm 6i \cdot \sqrt{2}

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