Bytelearn - cat image with glassesAI tutor

Welcome to Bytelearn!

Let’s check out your problem:

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

+-sqrt(-15)=+-

◻

Express the radical using the imaginary unit, i i .\newlineExpress your answer in simplified form.\newline±15=± \pm \sqrt{-15}= \pm \square

Full solution

Q. Express the radical using the imaginary unit, i i .\newlineExpress your answer in simplified form.\newline±15=± \pm \sqrt{-15}= \pm \square
  1. Recognize square root of negative number: First, we recognize that the square root of a negative number involves the imaginary unit ii, where i2=1i^2 = -1. We can rewrite the square root of 15-15 as the square root of 1-1 times the square root of 1515.\newline±15=±1×15\pm\sqrt{-15} = \pm\sqrt{-1 \times 15}
  2. Replace 1\sqrt{-1} with ii: Next, we know that 1\sqrt{-1} is the definition of the imaginary unit ii. So we can replace 1\sqrt{-1} with ii.\newline±1×15=±i×15\pm\sqrt{-1 \times 15} = \pm i \times \sqrt{15}
  3. Check if radical can be simplified: Now, we have the expression in terms of the imaginary unit ii. However, we need to check if the radical 15\sqrt{15} can be simplified further. Since 1515 is not a perfect square and does not have any perfect square factors other than 11, the radical is already in its simplest form.\newline±i×15=±i×15\pm i \times \sqrt{15} = \pm i \times \sqrt{15}
  4. Write expression in simplified form: Finally, we write the expression in its simplified form with the ±\pm sign indicating both the positive and negative possibilities.±i15=±i15\pm i \sqrt{15} = \pm i\sqrt{15}

More problems from Introduction to complex numbers