Real Numbers and Imaginary Numbers Exercises

Answer

Since the square root of 9 is 3, we can simplify this as -√9 = -3. That's a negative integer. It also counts as a rational number and a real number.

Answer

It's imaginary. To get x by itself, we need to take the square root of both sides. But the square root of -4 is 2i, which is imaginary. Check it out: (2i)² = (2²)(i²) = 4i² = 4(-1) = -4.