Math Problem Statement

Grafik fungsi y = ax^2 + bx + c ditunjukkan di bawah ini. Pernyataan yang benar adalah….

Solution

This problem involves analyzing the properties of a quadratic function y=ax2+bx+cy = ax^2 + bx + c given its graph, and determining which statement about the constants aa, bb, and cc is correct.

From the image:

  • The graph is a parabola that opens upward, indicating that a>0a > 0.
  • The parabola crosses the xx-axis at two points, so the discriminant Δ=b24ac>0\Delta = b^2 - 4ac > 0 (there are two real roots).
  • The parabola crosses the yy-axis above the origin, indicating that c>0c > 0.
  • abab depends on the relative signs of aa and bb.

We analyze each choice to determine the correct statement:


Key observations:

  1. a>0a > 0 since the parabola opens upwards.
  2. bb can be positive or negative (depending on the symmetry of the graph).
  3. c>0c > 0 since the yy-intercept is positive.

Options analysis:

  • Option A: ab>0ab > 0 and a+b+c>0a + b + c > 0.
    ab>0ab > 0 implies b>0b > 0 (as a>0a > 0). This holds if a+b+c>0a + b + c > 0.

  • Option B: ab<0ab < 0 and a+b+c>0a + b + c > 0.
    Incorrect, as a>0a > 0, abab cannot be negative.

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Math Problem Analysis

Mathematical Concepts

Quadratic Functions
Graph Analysis

Formulas

y = ax^2 + bx + c
Discriminant Δ = b^2 - 4ac

Theorems

Properties of Parabolas
Sign of Coefficients

Suitable Grade Level

Grades 10-12