College Algebra CLEP Prep Practice Exam

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What is the equation of the axis of symmetry of the parabola y = 2x2 + 4x - 5?

x = -2
x = -1
x = 0
x = 1

The correct answer is: x = -2

The axis of symmetry of a parabola is a vertical line that divides the parabola into two symmetric halves. In order to find the equation of the axis of symmetry, we need to use the formula x = -b/2a, where a and b are the coefficients of the quadratic equation in the form of ax^2 + bx + c. In this given equation, a = 2 and b = 4. Plugging these values into the formula, we get x = -4/4 = -1. This means that the axis of symmetry is a vertical line passing through x = -1, which is the answer A. As for the other options, they are incorrect because they do not correspond to the formula x = -b/2a. Option B is the y-intercept of the parabola and does not represent the equation of the axis of symmetry