Question

Which expression is a polynomial? (Pic)

Answer 1

A polynomial is an expression consisting of variables and coefficients, that involves only the operations of addition, subtraction, multiplication, and non-negative integer exponents of variables.

Therefore your answer is
`x-\sqrt7`

`√(7x)` NOT, because x is in square root.

`(7)/(√(x))` NOT, because x is in square root and is in the denominator

`(7)/(x^2)` NOT, because x² is in the denominator.

Answer 2

the third answer is correct. hope I helped