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The real numbers are all the numbers including rational and irrational ones, however they do not include imaginary numbers. These are square root of negative numbers, they include the symbol "i" equivalent to square root of negative one, they do not exist as cartseian coordinates and a graph cannot contain them, they are only plotted as points on an argand diagram, between if you are not an A2 student, then you do not have to know about imaginary numbers. In addition, the domain is all real numbers (negative infinity < x < positive infinity) because if you substitute any value of x, then the graph would give a valid value for y.thanx but how do u kno dat domain is all real numbers and what are real numbers
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