Math Problem Statement

Berikut ini adalah parabola dengan persamaan f(x) = ax^2 + bx + c. Pernyataan yang sesuai dengan parabola di atas adalah: a > 0, b > 0, c > 0, b^2 > 4ac.

Solution

From the image you've provided, we have the following components:

  • The equation of the parabola is given as f(x)=ax2+bx+cf(x) = ax^2 + bx + c.
  • The graph shows a parabola that opens upwards (concave up), indicating that a>0a > 0.

Now, let's analyze the four statements:

  1. a>0a > 0:

    • Since the parabola opens upwards, the coefficient aa is positive.
    • This statement is TRUE.
  2. b>0b > 0:

    • The value of bb controls the horizontal shift of the vertex, but from just the shape of the parabola, it's not possible to directly conclude the sign of bb. We cannot be sure that b>0b > 0.
    • This statement is FALSE.
  3. c>0c > 0:

    • The constant cc represents the y-intercept of the parabola (the value of f(x)f(x) when x=0x = 0).
    • In this graph, the parabola intersects the y-axis above the origin, so c>0c > 0.
    • This statement is TRUE.
  4. b2>4acb^2 > 4ac:

    • This is the discriminant of the quadratic equation, which determines the number of real roots.
    • For b2>4acb^2 > 4ac, the equation would have two distinct real roots. However, the graph shows a parabola with one minimum point, suggesting that the discriminant is less than or equal to zero, meaning b24ac0b^2 - 4ac \leq 0.
    • This statement is FALSE.

In summary, the correct answers are:

  • a>0a > 0: BENAR (TRUE)
  • b>0b > 0: SALAH (FALSE)
  • c>0c > 0: BENAR (TRUE)
  • b2>4acb^2 > 4ac: SALAH (FALSE)

Would you like more details or clarifications on any of the points?

Here are five related questions to expand on this:

  1. What role does bb play in shifting the parabola horizontally?
  2. How does the discriminant b24acb^2 - 4ac affect the nature of the roots of a quadratic equation?
  3. Can you determine the vertex of the parabola using the coefficients aa, bb, and cc?
  4. How does the sign of aa affect the direction in which the parabola opens?
  5. What happens if b2=4acb^2 = 4ac in terms of the roots of the quadratic equation?

Tip: When analyzing quadratic equations, the discriminant Δ=b24ac\Delta = b^2 - 4ac is crucial for understanding the number and type of roots.

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Math Problem Analysis

Mathematical Concepts

Algebra
Quadratic Equations
Parabolas

Formulas

f(x) = ax^2 + bx + c
Discriminant: b^2 - 4ac

Theorems

Discriminant Theorem
Quadratic Formula

Suitable Grade Level

Grades 9-11