21
QuizMultiple Choice

Unit Test — Unit test

Question 21 • WSFCS Math 2 CR

Which function is a quadratic function?

Answer
A
y – 3x2 = 3(x2 + 5) + 1
B
y2 – 7x = 2(x2 + 6) + 7
C
y – 2x2 = 6(x3 + 5) – 4
D
y – 5x = 4(x + 5) + 9

Explanation

In choice A, expand the right side and isolate y: y − 3x² = 3x² + 16, so y = 6x² + 16. This has the form y = ax² + bx + c with a nonzero, so it is quadratic. Choice C includes an x³ term, D is linear, and B has y² rather than expressing y as a quadratic function of x.

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