Practice problem
Which of the following are real-numbered solutions? (Select all that apply.)
x=4x=4x=4
x=2ix=2ix=2i
x=12x=\frac{1}{2}x=21
x=i2x=i^2x=i2
x=4πx=4\pix=4π
x=3.724x=3.724x=3.724
Type a concept, like “slope” or “photosynthesis”.