Finding the Symmetry Point of 2x²: Locating the Vertex of a Quadratic Function

Vertex Formula with Simple Quadratic Functions

Given the expression of the quadratic function

Finding the symmetry point of the function

f(x)=2x2 f(x)=2x^2

❤️ Continue Your Math Journey!

We have hundreds of course questions with personalized recommendations + Account 100% premium

Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:08 Let's find the point of symmetry for the function.
00:12 This point is where, if you fold the parabola in half, both sides match perfectly.
00:17 So, each half will be equal to the other.
00:21 First, let's examine the function's coefficients.
00:24 We'll use the special formula to find the vertex point.
00:29 Substitute the given values into the formula, and solve for X to find the point.
00:34 This X value is the point of symmetry.
00:40 And that's how we solve this problem!

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)=2x2 f(x)=2x^2

2

Step-by-step solution

To solve this problem, we'll follow these steps:

  • Identify the coefficients of the quadratic function.
  • Apply the vertex formula to find the axis of symmetry and subsequently the vertex.
  • Calculate the function's value at the symmetry point.

Now, let's work through each step:
Step 1: The given function is f(x)=2x2 f(x) = 2x^2 , where a=2 a = 2 and b=0 b = 0 .
Step 2: The axis of symmetry for a quadratic function in the form ax2+bx+c ax^2 + bx + c is given by x=b2a x = -\frac{b}{2a} . With b=0 b = 0 , this simplifies to x=0 x = 0 .
Step 3: To find the vertex, calculate the function's value at x=0 x = 0 , using f(x)=2x2 f(x) = 2x^2 .
Plugging in x=0 x = 0 , we find:
f(0)=2(0)2=0 f(0) = 2(0)^2 = 0 .
Thus, the vertex, and hence the symmetry point of the function, is (0,0) (0, 0) .

Therefore, the solution to the problem 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 f(x) = ax² + bx + c, use x = -b/(2a)
  • Technique: With f(x) = 2x², b = 0, so x = -0/(2×2) = 0
  • Check: Substitute x = 0: f(0) = 2(0)² = 0, giving vertex (0,0) ✓

Common Mistakes

Avoid these frequent errors
  • Confusing vertex with y-intercept or x-intercept
    Don't assume the vertex is at (2,0) just because the coefficient is 2 = wrong location! The vertex requires using the formula x = -b/(2a), not guessing from coefficients. Always apply the vertex formula systematically.

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 (2,0)?

+

The coefficient 2 affects the parabola's width, not its vertex location. Since there's no x term (b = 0), the vertex lies on the y-axis at x=0 x = 0 .

What does 'symmetry point' mean?

+

The symmetry point is the same as the vertex! It's where the parabola is perfectly balanced - you can fold the graph along this point and both sides match exactly.

How do I remember the vertex formula?

+

Think: "negative b over 2a" gives you the x-coordinate. Then substitute that x-value back into the function to find the y-coordinate of the vertex.

What if there was an x term like f(x) = 2x² + 4x?

+

Then b = 4, so x=42(2)=1 x = -\frac{4}{2(2)} = -1 . The vertex would be at x = -1, not x = 0. The b term shifts the vertex sideways!

Is the vertex always the lowest point?

+

Only when a > 0 (parabola opens upward). Since a = 2 is positive here, (0,0) is indeed the lowest point. If a were negative, it would be the highest point.

🌟 Unlock Your Math Potential

Get unlimited access to all 18 The Quadratic Function questions, detailed video solutions, and personalized progress tracking.

📹

Unlimited Video Solutions

Step-by-step explanations for every problem

📊

Progress Analytics

Track your mastery across all topics

🚫

Ad-Free Learning

Focus on math without distractions

No credit card required • Cancel anytime

More Questions

Click on any question to see the complete solution with step-by-step explanations