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Which of the following is an example of a quadratic equation?

  1. y=x^2-6

  2. y=x+3

  3. y=2x^2-x+7

  4. y=2x+5

The correct answer is: y=2x^2-x+7

A quadratic equation is an equation where the highest power of the variable is 2, also known as a second degree polynomial. Option A is the only equation with a squared term, but it is a first degree polynomial since the highest power is 2. Option B and D are both linear equations with the highest power being 1. Only option C has a squared term and is a second degree polynomial, making it an example of a quadratic equation.