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Mathematics
Problem
Which of the following expressions is a polynomial in the variable
x
x
x
? a)
3
x
−
2
+
7
3x^{-2}+7
3
x
−
2
+
7
b)
2
x
+
x
\dfrac{2}{\sqrt{x}}+x
x
2
+
x
c)
5
x
3
+
4
x
2
−
x
+
8
5x^{3}+4x^{2}-x+8
5
x
3
+
4
x
2
−
x
+
8
d)
x
2
+
3
x
+
1
x^{2}+3\sqrt{x}+1
x
2
+
3
x
+
1
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