Discover the Symmetry in the Quadratic f(x) = 1/2x^2

Quadratic Functions with Vertex Identification

Given the expression of the quadratic function

Finding the symmetry point of the function

f(x)=12x2 f(x)=\frac{1}{2}x^2

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Find the point of symmetry in the function
00:03 We'll use the formula to calculate the vertex point
00:07 We'll look at the function's coefficients
00:10 The point of symmetry is the point where if you fold the parabola in half
00:13 The halves will be equal to each other
00:17 We'll substitute appropriate values according to the given data and solve for X at the point
00:26 This is the X value at the point of symmetry
00:30 Now we'll substitute this X value in the function to find the Y value at the point
00:45 This is the Y value at the point of symmetry
00:51 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Given the expression of the quadratic function

Finding the symmetry point of the function

f(x)=12x2 f(x)=\frac{1}{2}x^2

2

Step-by-step solution

To determine the symmetry (vertex) point of the quadratic function f(x)=12x2 f(x) = \frac{1}{2}x^2 , we will use the formula for the x-coordinate of the vertex (or axis of symmetry) for a general quadratic function f(x)=ax2+bx+c f(x) = ax^2 + bx + c , which is given by:

  • x=b2a x = -\frac{b}{2a}

In this problem, the coefficients are a=12 a = \frac{1}{2} , b=0 b = 0 , and c=0 c = 0 . By substituting these values into the vertex formula:

x=02×12=0 x = -\frac{0}{2 \times \frac{1}{2}} = 0

This tells us that the x-coordinate of the vertex is 0 0 . To find the y-coordinate of the vertex, we substitute x=0 x = 0 back into the function f(x)=12(x2) f(x) = \frac{1}{2}(x^2) :

f(0)=12(0)2=0 f(0) = \frac{1}{2}(0)^2 = 0

Thus, the vertex of the function, also its symmetry point, is at the coordinate (0,0) (0,0) .

Therefore, the symmetry point of the function f(x)=12x2 f(x) = \frac{1}{2}x^2 is (0,0) (0, 0) .

3

Final Answer

(0,0) (0,0)

Key Points to Remember

Essential concepts to master this topic
  • Vertex Formula: For ax² + bx + c, x-coordinate is -b/(2a)
  • Technique: With a = 1/2, b = 0: x = -0/(2×1/2) = 0
  • Check: Substitute back: f(0) = (1/2)(0)² = 0, so vertex is (0,0) ✓

Common Mistakes

Avoid these frequent errors
  • Using the wrong vertex formula or forgetting the coefficient
    Don't use x = -b/a or ignore the coefficient 1/2 = wrong vertex! This gives incorrect coordinates like (-1,0) or (1,0). Always use x = -b/(2a) and identify a = 1/2, b = 0 carefully.

Practice Quiz

Test your knowledge with interactive questions

Given the expression of the quadratic function

Finding the symmetry point of the function

\( f(x)=-5x^2+10 \)

FAQ

Everything you need to know about this question

Why is the vertex at (0,0) and not somewhere else?

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Since f(x)=12x2 f(x) = \frac{1}{2}x^2 has no linear term (b = 0), the parabola is perfectly centered on the y-axis. The vertex formula gives x = 0, and f(0) = 0.

What does the coefficient 1/2 do to the parabola?

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The coefficient 12 \frac{1}{2} makes the parabola wider than y = x². It doesn't change the vertex location, just the shape - smaller coefficients create wider parabolas.

How do I remember the vertex formula?

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Think "negative b over 2a" for the x-coordinate: x=b2a x = -\frac{b}{2a} . Then substitute this x-value back into the function to find the y-coordinate.

What if there was a constant term like +3?

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A constant term shifts the parabola up or down but doesn't change the x-coordinate of the vertex. So f(x)=12x2+3 f(x) = \frac{1}{2}x^2 + 3 would have vertex at (0,3).

Is the vertex always the lowest point?

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Only when a > 0 (parabola opens upward). Since a=12>0 a = \frac{1}{2} > 0 here, the vertex (0,0) is indeed the minimum point of this function.

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