Question

20 points

Which expression is a polynomial?

A. 7/x^2

B. x - √ 7

C. 7/ √ x

D. √ 7x

Answer 1

B.

Explanation:

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.

`A.\ (7)/(x^2)=7x^(-2)\qquad\bold{NOT}\\\\B.\ x-\sqrt7\qquad\bold{YES}\\\\C.\ (7)/(√(x))=7x^{-(1)/(2)}\qquad\bold{NOT}\\\\D.\ √(7x)=\sqrt7\cdot√(x)=\sqrt7 x^(1)/(2)\qquad\bold{NOT}`