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Mathematics
Mathematics
Problem
Which of the following functions is quadratic? a)
x
4
−
x
2
x^4 - x^2
x
4
−
x
2
b)
2
x
2
+
5
x
−
1
2x^2 + 5x - 1
2
x
2
+
5
x
−
1
c)
4
x
+
7
4x + 7
4
x
+
7
d)
x
3
−
4
x
x^3 - 4x
x
3
−
4
x
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