Math Problem Statement

Which coordinate pair is the vertex of y = x^2 + 4x + 1?

Solution

The equation provided is y=x2+4x+1y = x^2 + 4x + 1, which is a quadratic equation. The vertex of a parabola given by y=ax2+bx+cy = ax^2 + bx + c can be found using the formula for the x-coordinate of the vertex:

x=b2ax = -\frac{b}{2a}

In this case, the equation is y=x2+4x+1y = x^2 + 4x + 1, where:

  • a=1a = 1
  • b=4b = 4

Now, let's find the x-coordinate of the vertex:

x=42(1)=2x = -\frac{4}{2(1)} = -2

To find the y-coordinate, we substitute x=2x = -2 back into the equation:

y=(2)2+4(2)+1=48+1=3y = (-2)^2 + 4(-2) + 1 = 4 - 8 + 1 = -3

So, the vertex is at (2,3)(-2, -3).

Thus, the correct answer is (2,3)\boxed{(-2, -3)}.

Would you like more details or have any further questions?

Here are 5 related questions you might explore:

  1. How do you find the axis of symmetry for a quadratic function?
  2. What is the importance of the discriminant in a quadratic equation?
  3. How does the value of aa affect the direction of a parabola?
  4. Can you convert the quadratic equation y=x2+4x+1y = x^2 + 4x + 1 into vertex form?
  5. How do you graph a quadratic function using its vertex and intercepts?

Tip: The vertex form of a quadratic equation is useful for identifying the vertex directly and is given by y=a(xh)2+ky = a(x-h)^2 + k, where (h,k)(h, k) is the vertex.

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Math Problem Analysis

Mathematical Concepts

Algebra
Quadratic Equations
Parabolas

Formulas

x = -b / (2a)
y = ax^2 + bx + c

Theorems

Vertex formula for parabolas

Suitable Grade Level

Grades 9-11