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 $x-\sqrt7$

$\sqrt{7x}$ NOT, because x is in square root.

$\dfrac{7}{\sqrt{x}}$ NOT, because x is in square root and is in the denominator

$\dfrac{7}{x^2}$ NOT, because x² is in the denominator.

Answer 2

the third answer is correct. hope I helped