Q. Express the radical using the imaginary unit, i.Express your answer in simplified form.±−15=±□
Recognize square root of negative number: First, we recognize that the square root of a negative number involves the imaginary unit i, where i2=−1. We can rewrite the square root of −15 as the square root of −1 times the square root of 15.±−15=±−1×15
Replace −1 with i: Next, we know that −1 is the definition of the imaginary unit i. So we can replace −1 with i.±−1×15=±i×15
Check if radical can be simplified: Now, we have the expression in terms of the imaginary unit i. However, we need to check if the radical 15 can be simplified further. Since 15 is not a perfect square and does not have any perfect square factors other than 1, the radical is already in its simplest form.±i×15=±i×15
Write expression in simplified form: Finally, we write the expression in its simplified form with the ± sign indicating both the positive and negative possibilities.±i15=±i15
More problems from Introduction to complex numbers