Domain, you know? For example, f(x)=2x+3 can also be written as y=2x+3, and the domain is the value range of x, that is, the independent variable x of this function must take its value from the domain. A function, if its definition domain and algorithm (that is, 2x+3) are determined, then its calculated y also has a range, and this range is the range of this function.

For example, f(x)=2x+3, and the domain is 1 to 2 (haven't you learned intervals? That's it), then the range is 5 to 7. Is that clear?

I am a sophomore this year, so I can add qq in the summer vacation. Ask me if you don't understand.

Give me your email and I'll send you qq.