Find X Values in the Graph Where f(x) > 0: A Visual Analysis

Quadratic Functions with Graph Analysis

Based on the data in the diagram, find for which X values the graph of the function f(x)>0 f\left(x\right) > 0

XXXYYY-2-2-2222000

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Step-by-step written solution

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1

Understand the problem

Based on the data in the diagram, find for which X values the graph of the function f(x)>0 f\left(x\right) > 0

XXXYYY-2-2-2222000

2

Step-by-step solution

The problem is asking us to identify for which x x values f(x)>0 f(x) > 0 based on the graph provided, which seems to depict a quadratic function. Let's go step-by-step:

First, we need to determine the points where the function intersects the x-axis, which are the roots of the function. The graph shows these intersections at x=2 x = -2 and x=2 x = 2 . These are the points where the function is equal to zero, f(x)=0 f(x) = 0 .

Next, we observe the overall shape of the graph to understand where f(x)>0 f(x) > 0 (i.e., where the graph is above the x-axis). Typically for a quadratic function, which is a parabola, the parabola will be above the x-axis outside the roots if it opens upwards, and between the roots if it opens downwards, given that a(xx1)(xx2)=0 a(x - x_1)(x - x_2) = 0 with root analysis on a>0 a > 0 .

In the provided graph, the parabola appears to open upwards. Therefore, the function f(x) f(x) is positive when x x is less than the smaller root, 2 -2 , or greater than the larger root, 2 2 . This is a typical behavior for a quadratic function which opens upwards, where it takes negative values inside the range of its roots and positive values outside.

Conclusively, f(x)>0 f(x) > 0 for the intervals where x<2 x < -2 or x>2 x > 2 .

Therefore, the solution to the problem is x>2 x > 2 or x<2 x < -2 .

3

Final Answer

x>2 x > 2 or x<2 x < -2

Key Points to Remember

Essential concepts to master this topic
  • Zero Rule: Function equals zero at x-intercepts where graph crosses axis
  • Sign Analysis: Upward parabola is positive outside roots: x < -2 or x > 2
  • Verification: Graph is above x-axis when f(x) > 0 ✓

Common Mistakes

Avoid these frequent errors
  • Reading between the roots as positive
    Don't assume f(x) > 0 between x = -2 and x = 2 = wrong intervals! For upward-opening parabolas, the function is negative between the roots. Always check which side of the x-axis the graph lies on in each interval.

Practice Quiz

Test your knowledge with interactive questions

The graph of the function below does not intersect the \( x \)-axis.

The parabola's vertex is marked A.

Find all values of \( x \) where
\( f\left(x\right) > 0 \).

AAAX

FAQ

Everything you need to know about this question

How do I know if the parabola opens upward or downward?

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Look at the shape of the curve! If it looks like a U (lowest point in middle), it opens upward. If it looks like an upside-down U (highest point in middle), it opens downward.

What happens exactly at the x-intercepts?

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At the x-intercepts (where the graph crosses the x-axis), f(x)=0 f(x) = 0 . These points are not included when we're looking for where f(x)>0 f(x) > 0 .

Why is the answer 'x > 2 or x < -2' instead of 'x < -2 or x > 2'?

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Both ways are correct! The word 'or' means either condition works, so the order doesn't matter. You can write it either way.

How do I read the graph to find where f(x) > 0?

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Look for where the graph is above the x-axis. These are the regions where the function values are positive. In this case, it's the left and right 'arms' of the parabola.

What if the parabola just touches the x-axis at one point?

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If the parabola just touches (doesn't cross) the x-axis, that's called a repeated root. The function would still be positive on one side and never negative, or vice versa.

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