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Axis of symmetry formula for a parabola is, x = -b/2a. Let us derive the equation of the axis of symmetry. The quadratic equation of a parabola is, y = ax 2 + bx + c (up/down parabola). The constant term 'c' does not affect the parabola.Therefore, let us consider, y = ax 2 + bx.
Aug 3, 2023 · The vertex form of a quadratic equation is y = a (x – h) 2 + k, Equation of axis of symmetry is, x = h, here (h, k) = vertex of the parabola. We obtain the vertex of the function (x, y) by substituting the value of x in the standard form of the equation and get the value of y. Let us solve some examples involving the above formulas and concepts.
Since the parabola is symmetrical around its vertex, the axis of symmetry is a vertical line passing through the vertex. Therefore, the axis of symmetry is x = 1. Example 3. Write the equation for the axis of symmetry. y = x 2 + 8 x + 11. Solution: The vertex of the parabola is at (− 4, − 5).
One formula works when the parabola's equation is in vertex form and the other works when the parabola's equation is in standard form . Standard Form If your equation is in the standard form $$ y = ax^2 + bx + c $$ , then the formula for the axis of symmetry is: $ \red{ \boxed{ x = \frac {-b}{ 2a} }} $
Oct 8, 2024 · This is the equation of the axis of symmetry for parabolas in the standard form y = ax 2 + bx + c. Similarly, if the parabola opens horizontally (i.e., left/right), we can get the equation for the axis of symmetry by finding the midpoint of the y-intercepts. Finding the Axis of Symmetry of the Parabola y = 2x2 + 8x + 5.
Therefore, the axis of symmetry is x = 3. Example 2: Find the axis of symmetry of the graph of y = 2x 2 + 8x – 3, using the formula. Solution: Given, y = 2x 2 + 8x – 3. Comparing the given equation with the standard form y = ax 2 + bx + c, a = 2, b = 8, c = -3. And the axis of symmetry is a vertical line; x = -b/2a. Substituting the values ...
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Jan 3, 2024 · To derive the Axis of Symmetry for a parabola, we start with the quadratic function y = ax² + bx + c. This is set to zero and solved for x, yielding the formula x = -b/2a. This value of x represents the x-coordinate of the vertex of the parabola, which is the Axis of Symmetry. It’s where the parabola reaches its peak (or valley) and shows ...
