is a polynomial .
Explanation:
We have , the following expression x^2/7+1 ,i.e.
.
A polynomial function is a function such as a quadratic, a cubic, a quadratic, and so on, involving only non-negative integer powers of x. Some examples are :
f(x)=3x−2 Linear polynomial (linear function)
f(x)=
Quadratic polynomial
f(x)=−
Cubic polynomial with no quadratic term
f(x)=(x−3)2(2x−1)
A polynomial of degree n is a function of the form:
for a quadratic polynomial , here equation :
⇒

⇒
which is equivalent to
.Hence,
is a polynomial .