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A quadratic equation can be written in vertex form as y = a(x - h)2 + k. Which of the following is a quadratic equation in standard form?

  1. y = 4x2 + 3

  2. y = (x + 5)2 - 10

  3. y = 4x2 + 4

  4. y = -2(x - 3)2 + 4

The correct answer is: y = 4x2 + 4

A quadratic equation in standard form is written as y = ax^2 + bx + c. In the given equation, option C is the only one that follows this form, with a being 4, b being 0, and c being 4. The other options have an x-term with a coefficient other than 4, and/or a constant term that is not equal to 4.