24
QuizMultiple Choice

Unit Test — Unit test

Question 24 • WSFCS Math 2 CR

Which function is a quadratic function?

Answer
A
a(x) = –2x3 + 2x – 6
B
b(x) = 5x3 + 8x2 + 3
C
c(x) = –8x2 + 3x – 5
D
d(x) = 6x4 + 2x – 3

Explanation

A quadratic function has a highest power of x equal to 2. In choice C, c(x) = −8x² + 3x − 5, the highest power is 2, so it is quadratic. Choices A and B include x³ terms, and choice D includes an x⁴ term.

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