Re-express −18−−−−√ as a complex number with the imaginary unit i=−1−−−√ .(1 point)
To express -√18 as a complex number with the imaginary unit i, we rewrite it as -√(9*2).
Taking the square root of 9, we have -√9 * √2.
Since √9 = 3, we can rewrite the expression as -3√2.
Now we can express -3√2 as a complex number by multiplying it by i:
-3√2 * i = -3i√2.
Therefore, -√18 can be expressed as -3i√2.