Solve the Inequality: Finding Where f(x) > 0 on the Graph

Question

Find all values of x x

where f\left(x\right) > 0 .

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Video Solution

Step-by-Step Solution

The problem requires us to determine where the function f(x) f(x) , depicted in the graph, is greater than 0. This interval will be where the graph lies above the x-axis. From the visual representation, the parabola intersects the x-axis at x=5 x = 5 .

Given it is a standard parabola opening upwards or downwards, we need to determine the regions of positivity based on its graph above the x-axis. Usually, a quadratic function, if it opens upwards, has negative values between its roots, provided there's a minimum point. If it opens downwards, the opposite is true.

From the graph, observe that the parabola is indeed below the x-axis at point x=5 x = 5 . The function is positive on both sides away from the point where it intersects (the ends of the parabola ascend back above the x-axis).

To find the solution, notice:

  • At x=5 x = 5 , the function equals zero at this point.
  • The function is positive on the intervals x<5 x < 5 and x>5 x > 5 .

Thus, the values of x x for which f(x)>0 f(x) > 0 are on the intervals (,5)(-\infty, 5) and (5,)(5, \infty).

The function f(x) f(x) is positive for x<5 x < 5 or x>5 x > 5 . Therefore, the correct answer is: x<5 x < 5 or x>5 x > 5 .

Answer

x < 5 or x > 5