College Algebra CLEP Prep Practice Exam

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Which of the following equations is quadratic?

  1. y + 6 = 5x

  2. y2 - 6y = 9

  3. x2 + 10x = 15

  4. 4y - 8 = 10

The correct answer is: x2 + 10x = 15

A and D are both linear equations since they have a maximum exponent of 1, meaning they represent a straight line on a graph. B is a quadratic equation since it has an exponent of 2, but it is not in the correct format. The correct format for a quadratic equation is ax^2 + bx + c = 0, so B would need to be rewritten as y^2 - 6y - 9 = 0. Therefore, the only equation that is correctly written in quadratic form is C.

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