State the following polynomials as polynomials in one variable, two variables etc.
i. \(x^2 + x + 1\) is a
ii. \(y^3 – 5z\) is a
iii. \(xy + yz + zx\) is a
iv. \(x^2 + 2xy - y^2 + 1\) is a
Answer variants:
Polynomial in one variable
Polynomial in three variable
Polynomial in two variable