
The word symmetry comes from the Greek word symmetria, meaning agreement in proportions or dimensions. Therefore, symmetry was used to denote the balance in beautiful and harmonious nature.
In geometry, the term symmetry denotes a shape or object divided into two identical parts.
A line of symmetry is an imaginary line by which the object or shape can be folded into two halves or appear like a mirror image. Different objects have a different axis of symmetry.
For a parabola, the axis of symmetry is given by the formula, x=−b/2a for Quadratic Equation, y=ax2+bx+c where, a and b are coefficients of x2 and x respectively. c is a constant term.
Find the axis of symmetry of the graph of y = 2x2 + 8x – 3, using the formula.
Solution
Given,
y = 2x2 + 8x – 3
Comparing the given equation with the standard form y = ax2 + bx + c,
a = 2, b = 8, c = -3
And the axis of symmetry is a vertical line; x = -b/2a
Substituting the values of a and b,
x = -8/2(2)
= -8/4
= -2
Therefore, the axis of symmetry is x = -2.
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