Math Problem Statement

Diketahui parabola dengan persamaan f(x) = x^2 - 2x + 3. Jika diperhatikan, Parabola tersebut akan terbuka ke atas dengan sumbu simetri di sebelah kanan sumbu y. Parabola memotong sumbu y di (0, 3) dan parabola tidak memotong sumbu x. Grafik fungsi tersebut mempunyai nilai minimum y = 2.

Solution

The image shows a problem related to the properties of a parabola, given by the function f(x)=x22x+3f(x) = x^2 - 2x + 3. Let's break down the information:

  • The equation of the parabola is f(x)=x22x+3f(x) = x^2 - 2x + 3, which is a quadratic function.
  • The problem provides several properties of this parabola:
    1. The parabola opens upwards ("atas"), which is indicated by the positive coefficient of x2x^2 in the quadratic function.
    2. The axis of symmetry is on the right ("kanan") of the y-axis. This is determined by the vertex's x-coordinate.
    3. The parabola intersects the y-axis at the point (0,3)(0, 3), which is found by evaluating f(0)=3f(0) = 3.
    4. The parabola does not intersect the x-axis ("tidak memotong sumbu x"), meaning it has no real roots (discriminant is negative).
    5. The graph has a minimum value of y=2y = 2, which is the y-coordinate of the vertex.

Explanation:

  • Opening Direction: The parabola opens upwards because the coefficient of x2x^2 is positive.
  • Axis of Symmetry: The formula for the axis of symmetry is x=b2ax = -\frac{b}{2a}, where a=1a = 1 and b=2b = -2. This gives x=1x = 1, meaning the axis of symmetry is at x=1x = 1, to the right of the y-axis.
  • Vertex: The y-coordinate of the vertex is calculated by substituting x=1x = 1 into the equation. f(1)=(1)22(1)+3=2f(1) = (1)^2 - 2(1) + 3 = 2, so the vertex is (1,2)(1, 2).
  • Intersection with y-axis: The y-intercept occurs at x=0x = 0, giving f(0)=3f(0) = 3, so the point is (0,3)(0, 3).
  • No x-axis intersection: The discriminant Δ=b24ac\Delta = b^2 - 4ac is (2)24(1)(3)=412=8(-2)^2 - 4(1)(3) = 4 - 12 = -8, which is negative, indicating no real roots and no x-intercepts.

Would you like a detailed breakdown of any of these points?

Related Questions:

  1. How do we find the vertex of a parabola using its equation?
  2. Why does the parabola open upwards in this case?
  3. How can we determine whether a parabola has real roots?
  4. What is the role of the discriminant in quadratic functions?
  5. Can you explain how to find the axis of symmetry?

Tip:

To determine the direction of a parabola's opening, always check the sign of the coefficient of x2x^2. A positive sign means the parabola opens upwards, and a negative sign means it opens downwards.

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Math Problem Analysis

Mathematical Concepts

Algebra
Quadratic Functions
Graphing Parabolas

Formulas

Quadratic function: f(x) = ax^2 + bx + c
Vertex form: x = -b / 2a
Discriminant: Δ = b^2 - 4ac

Theorems

Quadratic formula
Properties of parabolas: axis of symmetry, vertex, and intercepts

Suitable Grade Level

Grades 8-10