Solve (x-4.4)(x-2.3) > 0: Finding Positive Values of a Quadratic Function

Question

Look at the function below:

y=(x4.4)(x2.3) y=\left(x-4.4\right)\left(x-2.3\right)

Then determine for which values of x x the following is true:

f(x) > 0

Step-by-Step Solution

To solve this problem, we need to analyze where the expression (x4.4)(x2.3) (x - 4.4)(x - 2.3) is greater than zero. We have two roots, x=4.4 x = 4.4 and x=2.3 x = 2.3 , which divide the number line into three intervals: x<2.3 x < 2.3 , 2.3<x<4.4 2.3 < x < 4.4 , and x>4.4 x > 4.4 .

Let's check these intervals:

  • For x<2.3 x < 2.3 , both (x4.4) (x - 4.4) and (x2.3) (x - 2.3) are negative, resulting in a positive product.
  • For 2.3<x<4.4 2.3 < x < 4.4 , (x4.4) (x - 4.4) is negative and (x2.3) (x - 2.3) is positive, resulting in a negative product.
  • For x>4.4 x > 4.4 , both (x4.4) (x - 4.4) and (x2.3) (x - 2.3) are positive, resulting in a positive product.

Thus, the expression (x4.4)(x2.3)>0 (x - 4.4)(x - 2.3) > 0 holds in the intervals x<2.3 x < 2.3 and x>4.4 x > 4.4 .

Therefore, the solution is x>4.4 x > 4.4 or x<2.3 x < 2.3 .

Answer

x > 4.4 or x < 2.3